What can i do to help my 4 year old lefty?

We had an idea that he may be left handed, but were not sure until this year when he started pre-k because he would use both of his hands for things. Since he began writing, he only uses his left hand. He is the only lefty in the cl and all of the school supplies the school provides are for right handed children. what kinds of things are available to help make things easier for left handed children? He is in Occupational therapy for fine motor skills, but i am beginning to think his motor skills are fine, he is just having a hard time using tools that are meant for right handed people.