Count upwards, one number at a time, instead of saying a number with a 5 in it or a multiple of 5 say "bottles", instead of 7's or multiples of 7 says "Caps".

If a number has a 5 in it and is also a multiple of 5, say "Bottles Bottles". E.g. 5 is Bottles Bottles, 7 is Caps Caps, 10 is Bottles, 14 is Caps, 15 is Bottles Bottles, 17 is Caps. 25 is Bottles Bottles Bottles (5 * 5 with a 5 in it). 35 is bottles bottles caps.

This game is easy to learn and everyone will drink, but it gets boring quickly. The best way to play it is elimination - once you get it wrong, you're out and the game restarts from 1. This goes on until only 1 person is left, then restarts with everyone in.