 Enough to boil some water to pour in my mouth now. As far as estimation of how much fuel you'll need for that adventure, how do people do that? I've underestimated times in the past. We've built our own buddy burners out of wax and cardboard and things, and we were estimating it would take several meals and found out it did one. Ended up eating cold cereal the rest of the time. Any suggestions on how to estimate properly how much fuel you'll need for the camp cooking?