DIY PVC Survival Cache...Survival caches are catching on in the homesteader and prepper communities. They are becoming a large part of what prepping is all about – redundancy. You want to have more than one of most things you have. After all, “two is one, one is none,” right? You don’t want to keep everything in one place, either, just in case of an emergency (or, God forbid, you have to bug out). That’s where the survival cache comes in!