Basically, you will just be putting puffer food into the tank. However, if you have the tank space, you might be able to put in large snails that would be too large for the puffer to eat.
You're going to need to keep the puffer's teeth ground down anyway, and usually thats done by feeding snails or hermits. You could just buy snails in bulk, and consider them to be puffer food that helps tidy up while waiting their turn at the table.