I use a sportline waterbottle I got at wal-mart for 5 bucks. I liked it so much I bought another and my buddies at work had me pick up a couple for them. I've dropped it off a moving forktruck several times. the only thing I replaced was the carabiner for a more heavy duty one. when I run across more I'll buy them up. I like that it has a metal bottom and plastic you can see thru. I've never tried to boil water in one but I've seen les shroud boil in a cheap disposeable plastic bottle. tho I'm sure you'd have to be careful.