At a bare minimum, a few rolls of toilet paper and a pack of baby wipes should be in your kit, but we can do much better than that. Dental care can be provided by a toothbrush for each group member, a spool of floss, and a tube of toothpaste. Hand sanitizer is a nice option to stay clean in situations with limited water. If water is abundant, a bar of soap that can wash hands, bodies, hair, dishes, and clothes is very helpful. You might need a toilet at some point too, and this can be served by using a bucket (as both a container for supplies and then turned into a toilet as a terminal use).