I put iced tea in my base on occasion. I only do it when im going to smoke Nakhla Cardamom. I'm smoking some right now actually! Just make sure you clean it out real well with lemon juice and baking soda afterwards, and i will not have any negative effects on the hookah. You will get some flavor from the tea in the base, and it compliments the cardamom very well. Good luck with the experimenting!