Hey, I've recently been attempting to mod minecraft. I added this "Item" that I want to give you 2 potion effects. Currently, I have it adding ".setPotionEffect(Potion.jump.id, 60, 100, 1F)", I would also like it to add ".setPotionEffect(Potion.moveSpeed.id, 60, 100, 1F)". I would like to know if anyone can help me with this. PM me or respond.

I figured it out after some experimentation. First, I copied ItemFood, and edited my own copy of it: First, I took this:

    
private int potionId;
private int potionDuration;
private int potionAmplifier;
private float potionEffectProbability;

and turned it into this, as I wanted 3 effects:

private int potionId;
private int potionId2;
private int potionId3;
private int potionDuration;
private int potionDuration2;
private int potionDuration3;
private int potionAmplifier;
private int potionAmplifier2;
private int potionAmplifier3;
private float potionEffectProbability;
private float potionEffectProbability2;
private float potionEffectProbability3;

Then, I took

public NewPotion setPotionEffect(int par1, int par2, int par3, float par4)
    {
        this.potionId = par1;
        this.potionDuration = par2;
        this.potionAmplifier = par3;
        this.potionEffectProbability = par4;
        return this;
    }

and copied/pasted it right under the old one, then edited the new one, note that I changed the name from setPotionEffect to setPotionEffect2, and it uses the new vars, to look like this.

    public NewPotion setPotionEffect2(int par1, int par2, int par3, float par4)
    {
        this.potionId2 = par1;
        this.potionDuration2 = par2;
        this.potionAmplifier2 = par3;
        this.potionEffectProbability2 = par4;
        return this;
    }

Then, I Finally took the code that puts the effects on you, and made it put on the new Effects as well.

The original code looks like this:

    protected void func_77849_c(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer)
    {
        if (!par2World.isRemote && this.potionId > 0 && par2World.rand.nextFloat() < this.potionEffectProbability)
        {
            par3EntityPlayer.addPotionEffect(new PotionEffect(this.potionId, this.potionDuration * 20, this.potionAmplifier));
        }
    }

After editing, It should look like this:

    protected void func_77849_c(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer)
    {
        if (!par2World.isRemote && this.potionId > 0 && par2World.rand.nextFloat() < this.potionEffectProbability)
        {
            par3EntityPlayer.addPotionEffect(new PotionEffect(this.potionId, this.potionDuration * 20, this.potionAmplifier));
            par3EntityPlayer.addPotionEffect(new PotionEffect(this.potionId2, this.potionDuration2 * 20, this.potionAmplifier2));
        }
    }

Now, instead of just using:

.setPotionEffect(Potion.jump.id, 60, 2, 1F)

You can now use

.setPotionEffect2(Potion.moveSpeed.id, 60, 2, 1F)

And you want to use this code to get your sprites.

    public String getTextureFile()
    {
    	return "/sprites/yoursprites.png";
    }

Remember to use this code to add your new potions/food with multiple effects in-game:

TriplePotion = new NewPotion

And put all the things that you would normally put there.