You're onto it gadget. Soak it for as long as possible and then heat it at the end. Down side is that you have to clean the billy, the up side is it tastes slightly less like cardboard.
Also don't be stingy on the water. Better to be a bit sloppy than dry on the inside. Eating it half re-hydrated is bad for your guts. You don't poo for three days and then one morning you feel like you have given birth.
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