The config doesnt register the item id's and I dont know where to run the method from.

 

package MinespressoMod; //Package directory

import java.io.File;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraftforge.common.Configuration;
import cpw.mods.fml.client.registry.ClientRegistry;
import cpw.mods.fml.client.registry.RenderingRegistry;
import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.Mod.Instance;
import cpw.mods.fml.common.Mod.PostInit;
import cpw.mods.fml.common.SidedProxy;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPostInitializationEvent;
import cpw.mods.fml.common.network.NetworkMod;
import cpw.mods.fml.common.network.NetworkRegistry;
import cpw.mods.fml.common.registry.GameRegistry;
import cpw.mods.fml.common.registry.LanguageRegistry;

@Mod(modid="Minedrinks",name="Minespresso Mod",version="v2.1")
@NetworkMod(clientSideRequired=true, serverSideRequired=false,channels={"DrinksNetwork"}, packetHandler = PacketHandler.class)
public class Minespresso
{
//Server Side Stuff
@SidedProxy(clientSide = "MinespressoMod.ClientProxy", serverSide = "MinespressoMod.CommonProxy")
public static CommonProxy proxy;

@Instance("Minedrinks")
public static Minespresso instance;

public static int CoffeeID;
public static int TeaID;
public static int HotChocolateID;
public static int MinespressoID;
public static int CappuccinoID;
public static int LatteID;

public static int SugaryHotChocolateID;
public static int MagicMinespressoID;
public static int SugaryMagicMinespressoID;
public static int TheBombID;
public static int SleepyCoffeeID;
public static int HealTeaID;
public static int XPLatteID;
public static int StrengthCappuccinoID;
public static int MinespressoMachineID;

public static int CurrencyItemID;


public void initConfiguration(FMLInitializationEvent event){
	Configuration config = new Configuration(new File("config/MinespressoMod.cfg"));
	config.load();	
	CoffeeID = config.get("Drinks", "Coffee", 1130).getInt();	
	TeaID = config.get("Drinks", "Tea", 1131).getInt();
	HotChocolateID = config.get("Drinks", "HotChocolate", 1132).getInt();
	MinespressoID = config.get("Drinks", "Minespresso", 1133).getInt();
	CappuccinoID = config.get("Drinks", "Cappuccino", 1134).getInt();
	LatteID = config.get("Drinks", "Latte", 1135).getInt();
	SugaryHotChocolateID = config.get("Drinks", "SugaryHotChocolate", 1136).getInt();
	MagicMinespressoID = config.get("Drinks", "MagicMinespresso", 1137).getInt();
	SugaryMagicMinespressoID = config.get("Drinks", "SugaryMagicMinespresso", 1138).getInt();
	TheBombID = config.get("Drinks", "TheBomb", 1139).getInt();
	SleepyCoffeeID = config.get("Drinks", "SleepyCoffee", 1140).getInt();
	HealTeaID = config.get("Drinks", "HealTea", 1141).getInt();
	XPLatteID = config.get("Drinks", "XPLatte", 1142).getInt();
	StrengthCappuccinoID = config.get("Drinks", "StrengthCappuccino", 1143).getInt();
	MinespressoMachineID = config.get("Blocks", "DrinksMachine", 1144).getInt();
	CurrencyItemID = config.get("Currency", "Currency", 265).getInt();	
	config.save();
}

public static Item Coffee;
public static Item Tea;
public static Item HotChocolate;
public static Item Minespresso;
public static Item Cappuccino;
public static Item Latte;

public static Item SugaryHotChocolate;
public static Item MagicMinespresso;
public static Item SugaryMagicMinespresso;
public static Item TheBombMinespresso;
public static Item XPLatte;
public static Item HealTea;
public static Item StrengthCappuccino;
public static Item SleepyCoffee;

public static Block DrinksMachine;

public Minespresso(){
	// Register Regular Drinks
	Coffee = new ItemDrink(CoffeeID, 4, 4, false).setUnlocalizedName("Coffee");
	Tea = new ItemDrink(TeaID, 6, 6, false).setUnlocalizedName("Tea");
    HotChocolate = new ItemDrink(HotChocolateID, 3, 3, false).setUnlocalizedName("HotChocolate");
    Minespresso = new ItemDrink(MinespressoID, 10, 10, false).setUnlocalizedName("Minespresso");
    Cappuccino = new ItemDrink(CappuccinoID, 6, 6, false).setUnlocalizedName("Cappuccino");
	Latte = new ItemDrink(LatteID, 5, 5, false).setUnlocalizedName("Latte");

	//Register HotChocolate Drinks
	SugaryHotChocolate = new ItemSugaryDrink(SugaryHotChocolateID, 3, 3, false).setUnlocalizedName("SugaryHotChocolate");

	//Register Minespresso Drinks
	MagicMinespresso = new ItemMagicDrink(MagicMinespressoID, 3, 3, false).setUnlocalizedName("MagicMinespresso");
	SugaryMagicMinespresso = new ItemSugaryMagicDrink(SugaryMagicMinespressoID, 3, 3, false).setUnlocalizedName("SugaryMagicMinespresso");
	TheBombMinespresso = new TheBombItem(TheBombID, 14, 14, false).setUnlocalizedName("TheBombMinespresso");

	//Register Coffee Drinks
	SleepyCoffee = new ItemSleepyDrink(SleepyCoffeeID, 3, 3, false).setUnlocalizedName("SleepyCoffee");

	//Register Tea Drinks
	HealTea = new ItemHealDrink(HealTeaID, 6, 6, false).setUnlocalizedName("HealTea");

	//Latte
	XPLatte = new ItemXPDrink(XPLatteID, 5, 5, false).setUnlocalizedName("XPLatte");

	//Cappuccino 
	StrengthCappuccino = new ItemStrength(StrengthCappuccinoID, 6, 6, false).setUnlocalizedName("StrengthCappuccino");

	// Register Blocks
	DrinksMachine = new BlockDrinksMachine(1161, Material.iron).setUnlocalizedName("DrinksMachine").setHardness(3.5F);


	//Register Blocks
	GameRegistry.registerBlock(DrinksMachine, "DrinksMachine");
	GameRegistry.registerTileEntity(TileEntityMinespresso.class, "Minespresso");
	ClientRegistry.bindTileEntitySpecialRenderer(TileEntityMinespresso.class, new RendererMinespresso());


	LanguageRegistry.addName(Coffee, "Coffee");
	LanguageRegistry.addName(Tea, "Tea");
	LanguageRegistry.addName(HotChocolate, "Hot Chocolate");
	LanguageRegistry.addName(SugaryHotChocolate, "Hot Chocolate");
	LanguageRegistry.addName(Minespresso, "Minespresso");
	LanguageRegistry.addName(Cappuccino, "Cappuccino");
	LanguageRegistry.addName(Latte, "Latte");
	LanguageRegistry.addName(DrinksMachine, "Minespresso Machine");
	LanguageRegistry.addName(MagicMinespresso, "Minespresso");
	LanguageRegistry.addName(SugaryMagicMinespresso, "Minespresso");
	LanguageRegistry.addName(HealTea, "Tea");
	LanguageRegistry.addName(XPLatte, "Latte");
	LanguageRegistry.addName(SleepyCoffee, "Coffee");
	LanguageRegistry.addName(StrengthCappuccino, "Cappuccino");

	LanguageRegistry.addName(TheBombMinespresso, "The Bomb Minespresso");

	GameRegistry.addRecipe(new ItemStack(DrinksMachine), new Object[]{
		"XBX",
		"XSX",
		"XXX",
		'X', Block.blockIron, 'B', Block.stoneButton, 'S', Item.sugar
	});
}			
}

Well, to begin with, you aren't registering your Items at all.

Remember that you need to register all your items, blocks, tileentities, handlers etc if you actually want minecraft to know they exist.

I updated my code a little bit. And I did register the items and blocks