What works flawlessly for me is a soda pop bottle with standard lid. It stays screwed shut for soda under pressure, it works fine for alcohol.

To be safe, I put this in a ziplock, and carry it in the external mesh of my pack. Never had a problem over quite a number of miles, and never heard of any of many people I've known to use soda bottles to have problems either.

The Yellow HEET bottles: I typically repackage. I don't know if it's the offset design or what, but I typically find myself unhappy if I use the original yellow plastic bottle.

I've used juice type bottles and mini-gatorade type of bottles too --- these or smaller (12 oz?) soda bottles will fit in a quart rather than gallon ziplock. It's all good, and without the fancy opening top, never a problem.