What to mix with a gallon of vodka?

I need a recipe to mix with a gallon of plain vodka that I don't need to buy anymore alcohol for, and the ingredients are cheap. I'm mixing it all at the same time for a party in a large jug, not gl by gl, so I need the recipe in increments to match the gallon of vodka so it will at least cover the taste. And please nothing I'd have to pay over $15 for all the ingredients (excluding the alcohol, I already have that) Suggestions?