Sterilized water can be a valuable addition to your first aid supplies. It can be used for wound care, eye washes, and for mixing fluid replacement solutions for infants and young children.
Make your own sterilized water by canning water in a pressure canner. Process a full canner or fill in empty spaces in the canner with jars of water when canning something else that processes for 20 minutes or more. Complete instructions can be found here.