I know this seems so easy, and that is because it is!
Invest in some fabric napkins or cut so old sheets into 12×12 squares and stitch the edges to prevent fraying. We have a family of 4 and have 4 sets of 4 napkins. You can also use them as paper towels or purchase some inexpensive washcloths for this if you want better absorbancy.
Wash napkins and towels with your laundry. It also helps save some trees for our environment!
We decided to do this when we came into financial hardship and wondered why we never did it before. It saves us at least $20 a month.