Clean your Bak
I love CamelBak products but their cleaning products are expensive gimmicks. If you rinse your bladder out right when you get home with a common product you may already have in your home, denture cleaner, mouthwash, hydrogen peroxide, a little bleach, baking soda, etc. to kill any bacteria and store it in freezer you should have no issues. My favorite is 3-4 denture tablets over night, rinse, roll the bladder and store in a freezer bag to prevent the freezer burn taste. Now get outside!