John Campbell demonstrates how to eat and extract water from a cactus. You can eat a cactus from the hedgehog plant family. First, cut off the top of the cactus and skin down the sides, cutting off the cactus spines. Cutting the cactus will not hurt it because it can heal itself. The cactus meat will be like a sticky cucumber. Try to avoid the central core because it is stringy but you can eat the cactus meat. Wrap the meat in a bandana, squish it and wring it out to extract the water from the cactus. You can also eat the berries on a cholla cactus.