The rules are pretty simple. Get a slip-and-slide game setup or even just a massive tarp filled with water. Line up in teams of even numbers (if possible).
First, you must run, flop down or slide onto the wet tarp and make it all the way to the end. Get up, run to the table, and CHUGG your drink.
Then incorporate the rules of Flip Cup to flip your cup on the table before your next teammate can take their turn. The first team for all players to complete the task wins.