As you remove your aligners to eat or drink anything other than cold water, there are no restrictions on what you can eat and drink. Removing your aligners to eat prevents staining, the formation of cavities and disfigurement of the aligners due to heat.
We recommend you brush and floss your teeth after each meal before reinserting the aligners. Do not chew any kind of gum with your aligners in place; gum sticks to aligners and is difficult to remove other than with an extra visit to the dentist.