As it is imperative to stay hydrated while diving, (and to be well hydrated before beginning the first dive of the day), I’ll do whatever I can to drink as much as I can throughout the day. When diving from my own boat or with local friends and commercial operators on hot days, I bring along a pair of 2 liter bottles of ice. As they melt, they’re a source of cold water, and I can top them off as needed from a water jug or cooler. This allows me to avoid using the single serving disposable plastic bottles that are frequently supplied by some local operators. On cooler days or when diving in cold water, I’ll bring along one bottle of ice and a big thermos of tea, chocolate, or broth. Thus I tend to drink a lot each day, and don’t worry about my suits getting overly odiferous as my dry suits have pee valves, and my wet suits have relief zips.