Hydrogen peroxide, like Bleach loses its potency over time, even if the bottle is unopened. It's best to rotate stock on a regular basis. Regarding alcohol, it's great to start with a basic stock, but alcohol, in general, is easy to distill. Rather than storing a bunch of alcohol, why not store a still? Or better yet, learn how to use it now, and make your own concoctions. A still can be used to make essential oils, which often have medicinal properties.