For water, keep a bunch of clear plastic bottles on hand. You can use UV to sterilize it. Fill the bottles and leave them in full sun all day. The UV will kill the bugs. It will work on murky water, too, but will take several days. The cloudy water blocks the UV. Using the bottles in conjunction with some kind of solar reflector is even more affective, especially if it's capable of heating the water to about 150F or higher.
This method is being used by relief organizations in a number of 3d world countries where there's no electricity and polluted water is a major problem.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
