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>Is filling my bidons with coconut water an absolutely stupid idea?
Probably. Most bottles (and their valves in particular) are irregularly shaped so it's not easy to get them perfectly clean. If you put any kind of sugar into a bottle, you must clean it thoroughly after use, otherwise you're inviting bacteria to a party inside your bidon.
>If I want a reusable gel container style thing that I can put nut butter in (think like those single-serving squeeze packs you can buy, but that can be washed out and reused), what kinds of things can I use?
My reusable nut-butter squeeze pack responds best to gentle repetitive stroking...
I haven't seen such a product commercially available, but If you wanted a DIY solution, I'd start by looking at cake icing products for inspiration. I can't imagine it would be especially hard to rig a conveniently sized, washable pouch with a nozzle (with a cap to prevent premature discharge inside a jersey pocket) to a small packet filled with homemade gel.