Actually, I use a Klean Kanteen that’s an older version of this:
https://www.kleankanteen.com/products/water-bottle-wide-mouth-40-oz
And a Camelbak that’s something like this:
I’m open to using different bottles, but I kind of like the idea of the steel one (for health reasons, so as to not drink out of plastic). Would ideally like to be able to carry 2 1L bottles.
The next challenge would be choosing a fanny/waist/lumbar/hip pack that would be good for sliding the pockets/holsters onto.
I like Bill’s sling/hybrid creativity, but I really prefer just a fanny/lumbar/waist/hip pack for day-longs. And my former system (fanny pack with two pockets/holsters slid onto both sides of the belt) worked well. (Though if there’s a fanny pack with built-in bottle pockets that work well and allow me to carry 2L or close to it, I’d be happy to try that.)
