Yeah, thinking on that I was wondering if that would be totally feasible. I mean, I know I CAN fill 5 gallon bottles, but is its longevity for StarSan worth it?
What I was thinking of doing was getting a pump like these for one and pumping into my spray bottle that I keep around for StarSan. Would the "distilled" water from the 5 gallon stay "pure" enough over time? I wonder.
We take one of those 5 gallon water hugs from the grocery store, but carry it empty. Fill it at camp, then we use a pump to make hand washing, and bottle filling super easy. I'll never camp without it.
I can think of a few options... all depending on your expectations of power:
Dolphin Water Pump - BPA-Free Manual Drinking Water Pump - Fits Most 5-6 Gallon Water Coolers https://www.amazon.com/dp/B00APU2Y8Q/ref=cm_sw_r_cp_api_glt_fabc_MVJ89Z4B3CN1B62RNVQX
Water Dispenser 5 Gallon Water Pump (Black) https://www.amazon.com/dp/B08H4WMK37/ref=cm_sw_r_cp_api_glt_fabc_AX2VR0ARPFJMZSRBP1Z0?_encoding=UTF8&psc=1
https://www.target.com/p/igloo-bottom-load-water-dispenser-black/-/A-80180582
I have a couple of cheap, 5gal collapsible with spigots for use around camp... they are very difficult to carry with more than 4gal in them. They work OK for me, but I wouldn't recommend them, especially if you're going to be using it inside a trailer. We leave them tipped over with the spigot down and haven't had a problem with leaks, but we're outside and don't need to worry about it leaking all over.
My friend brings a 5gal round "office water cooler" jug, and has a manual pump that sits on top (not that one but something like it). There are also battery operated pumps which I haven't tried but might be nice. Though if you can't tip over the bottle, you may want to have a spare manual pump as a backup.
I've seen many grocery stores with pre-filled bottles or refill stations. If I had room in my sedan I'd probably do this over filling my collapsible containers at the campsite.