I think I have discovered some wonderful bottles for keeping about 3-4 oz of alcohol for my soda can stove. How about craft paint bottles that have the pouring spout type cap. You don't have to worry about people drinking it by mistake.

I have my suspiscions about caps that can be poured through. I fear that they would leak if I stuffed them in my pack and then fell backwards by accident (as occasionally happens to me) I use screw-top aluminum fuel stabilizer bottles with gasketed screw tops. I will look up the brand next time I'm in my trunk. Nice and strong and light and 4 oz in size. 1 works fine for a 3 day hike solo and they are small enough that I don't have a problem sticking a couple in the pack.

FWIW: MSR suggests the use of Nalgene bottles for alcohol fuels as the inside coating of their own metal fuel bottles will be affected by it. I have a small narrow neck Nalgene in urine yellow that I liberally marked with a Sharpie indicating it was for fuel only.

Chris