oh as for fluids, you can put literally anything into a camelbak; gatorade, sugar water, beer, vodka, just as long as you rinse it out with hot water after
I've done all of the above lol
I've also left water in it in the fridge for 3 months (woops) it grew mold, but only within the liquid, it didn't actually stick to the pack and I just rinsed it out and I used it another year before buying the ambush
On the blackhawk reservoirs, you can actually see mold eating through their anti-microbial layer
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