I once had a horrible experience with water & a hangover. (It was actually the morning after a Ragnar relay.) The good news is that it was mostly due to snorkeling in fairly rough waters. Lol Your pool is likely to be fairly flat. Hopefully the water will be refreshing. Have fun!
It wasn't bad, but I wasn't fast, lol. I downed a couple Tylenol and some coffee first. The HUGE upside is my H just left with the kids all day, and I'm going for a massage, facial, and pedicure. Wheeeee!!
DH and I once drank a lot at a conference, but got up early to do a timed 3000 yard swim. Surprisingly, I made it through (after a rough warm up). Everyone at the conference was very impressed that I beat him by ten seconds. They still tease him about it, especially since I drank way more than he did!