Like Tom I keep a cup on my boat. On bigger lakes I dip and drink- three cups. Also carry a pair of 1 liter bottles with clean water for portages or lakes that I don't trust. Not a fan of flavored beverages or "electrolyte drinks"- if you eat a good varied diet they are unnecessary. I add dried bananas to my morning porridge for potassium. Lots of nuts and beans in the canoe camping diet to replace the magnesium (the electrolyte that I run short of and prone to cramp if I'm eating junk)