Two things: 1 - Soda Bottles. I believe those are what DR suggests, but I also believe they contain BPA. The military cans are HDPE and thus BPA free. I have tons of BPA exposure, I figure reducing it where I can is worth something? Maybe not, I don't know. Anyways, soda bottles are good too.

I'm anti lifesaver jerry can. May be perfect for some, not for me. Why wouldn't I just use my Katdyn filter to fill my water can?