Stock up on bleach... For treating water, cuts, etc.
Bleach is very, very useful but remember it goes bad fairly quickly. I mean in a year or so, not weeks or months.
Better yet stock up on Calcium Hypochlorite. You can treat your water and make gallons of clean solution from just a pound of it!
Bleach has a relatively short shelf life. Read up on storing pool shock sodium hypochlorite to make bleach.
It decreases in strength about 50% every 12 months.
Hydrogen peroxide is completely 'flat' and useless after 12 months.
You shouldn’t use bleach or alcohol on wounds. Bleach can be used to disinfect surgical instruments and surfaces, but it is not an effective antibiotic because it also kills cells in the tissue, delays healing, and makes it more likely for a dangerous resistant infection to set in. Stock up on triple antibiotic ointments (neomycin/bacitracin/polymyxin) which promote wound healing.
Bleach Shelf life: http://www.clorox.com/blogs/dr-laundry/2007/08/07/bleach-shelf-life/
Just an FYI, bleach has a shelf life of about a year.