Enter how many adults come and how long the party lasts. See roughly how much to buy.
We started from an eight-hour party: per person, half a litre of wine, one beer, 100 ml of spirits, a litre of water and half a litre of soft drinks.
Ask the venue too. Some include drinks in the menu price, and others charge a fee for what you bring.
It is free. Create an account and these numbers come with you.
These are rough numbers, not quotes. You get real prices from vendors.