Ive carried alcohol also in plastic coke bottles or whatever--but I also would want to emphasize the risks of using any sort of regular looking drink container that could be mistakenly drunk from.

The other issue is overtightening to be "sure" its tight, and slightly cracking the cap or whatever and then having a mess happen.

I've had other small plastic containers that I have tried leak a bit, so now prefer to use a metal fuel bottle.

This makes me remember seeing folks selling gasoline in 1.5L or 2L plastic pop bottles along the side of the highway in Latin America.