I think the wristbands work on a pressure point principle. They're certainly worth a shot, perhaps combined with an OTC medication and cannabis... I wish I could remember the name of the one I was told to use when I fished out of Dutch. I don't get seasick in anything less than 30 foot waves, lol, but the stuff worked FANTASTIC for the couple nasty storms I've gone though. Shoot.
Don't drink, bring dry bread or crackers, and a couple oranges to suck on in case you do get thirsty.