For the fifteenth of my 25 Undead Christmas presents I want a MSR Water filter.
The runs will slow you down and make you tired, not a good thing when you never know when your going to need to run for it. The MSR water filter will purify any standing pool of water shy of raw sewage into clean, clear, refreshing water.
Its light, relatively small, and will keep you from getting the squirts. Its especially useful when you can’t light a fire but have a few toilet bowels still half full of water. An invaluable tool for surviving after the undead have taken over the world.