Thanks to Michele for this Frugal Baby Tip!
I use small containers to store my wet wipes (the ones that you buy flushable toddler wipes in) and soak enough wipes to last about 3-5 days. I used to use just tap water but I now add a bit of Dr. Bronner's castille soap (peppermint).
I make up about 2 cups of water with a squirt of soap and store the extra in another container and when my wet wipes run out I just soak more. They come in really handy to wash faces while out traveling, commercial wipes have too much soap in them and my 4 year old hated having his face washed with them, but he doesn't mind getting washed now that we use our own.