I'm looking into using some fuel tablets for cooking with a stove like this esbit as a backup/emergency stove when rafting. However I have heard that the fuel can easily foul food, clothing, etc. What's the recommended way to store and pack the fuel when rafting to help prevent package rupture?
They can easily foul food and clothing when they come into contact with it - but keep them separate and you should be fine. I tend to wrap up individually in foil, then in a big foil layer to make a "pack" of fuel cells, then wrap them in a bag. Unless you're really bashing your pack about, there shouldn't be any problem with that setup.