A simple idea, executed flawlessly. Pop on, get off.
A long dog tag chain (long enough to get on and off over hoods, mohawks etc.) with a small lobster clip at the end connected to a Nitrile O-Ring.
You slip this round any bottle that takes your fancy - popper, lubes, you name it and it's in an easy to access place around your neck.
Even with the cap off, the bottle doesn't come off the O-Ring. Use the lobster clip to take it off and share the fun and the Nitrile ring means you can spill anything on it without it breaking down.
Poppers not included.