Whether you're a hardcore survivalist, amateur woodsman, or somewhere in between, you never want to go too long without access to hot water. The SunRocket Solar Kettle ($67) takes the trouble out of heating or boiling water, whether you're looking to purify, melt snow, or cook a meal. It's small, so it fits conveniently in a pack, but it still holds 17 ounces. It can heat water in just 30 minutes, using only the power of the sun. Once you've heated it up, the kettle acts as a thermos, keeping water warm for hours.