I dehydrate very easily and I know it when I get massive headaches usually at night.  My gums will dry out too.  So, I got turned on to this product called Nunn.  It's flavored tablets you throw in the water bottle.  Good stuff.  I also have taken to keep a cup bungee dealied next to my seat and whenever I'm crossing a decent lake I just chug a few out of the lake.

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