Yes you can store it in the MSR fuel bottle but be ready to clean them up later on becasue of the small residue it leaves behind.

Also as something that you guys may not know but denaturated alcohol used to be a drink of choice for the poor working class during PHRASECENSOREDPOSTERSHOULDKNOWBETTER. times in Poland. They would put a piece of bread to act as a filter in order to take out the color and impurities. Crazy stuff I tell ya.