They can use school supplies, and that is what I usually what I bring on my school visits. There are lots of sales on supplies now, and I just bought some for our OAT trip to Morocco this fall. Got glue sticks, gel pens, erasers, binders, pencils, markers, colored pencils etc. Someone in our Turkey group brought blow-up balls with world maps on them. The schools are a wonderful experience. I'm a retired teacher so I especially enjoy the visit.