You don't need this in your shelter. In spite of all the best intentions it is all too easy to spill something, especially in the tense environment of a shelter. Keep all containers sealed. I find that coffee cans are excellent containers. When you eat a meal make a newspaper tablecloth.
Personal hygiene is all-important.
Your skin is your body seal against germ invasion. If you don't keep it clean it will respond with rashes and sores. Prewetted wipes are good for this. You can buy them in most drug stores and supermarkets.