I am throwing a surprise birthday for my husband on Saturday. I need help! Besides cake, I plan to serve snacks and drinks. I am making lemonade for the kids. And hard lemonade for the adults. How much vodka should I put for a 2 liter container? Is it half vodka/half lemonade?

I plan to have chips and salsa, pretzel rolls, ranch dip and veggies...what else? I want to keep it on the cheaper side.

TIA! And if anyone has a good recipie for a lemon cake... please post!

ETA: There will be about 25-30 people including kids coming!