I asked this recently because I have started using gatorade - vinegar was a popular suggestion to put in between uses. Someone also suggested generic denture tablets that are used to soak dentures overnight, since these are supposed to kill bacteria. I just picked up a box of these this morning ($4 for 90 tablets) because the vinegar is just so foul smelling.

I am curious to hear from anyone who responds to your post as to how many (if any) people wear camelbaks for either half or full marathons?

Baking Soda and water with lemon juice mixed in works great!

I have worn a Camel Bak on a few long runs (in excess of 20 miles), but I really don't like it because it chafes. I like to carry hand-helds instead. I either stash water/gatorade, have somebody meet me with supplies about the half way point, or else design my route where I can re-fuel. Besides, Camelbaks can be pretty heavy just starting out. I prefer to save those for hiking.

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I clean mine with diluted mouthwash.