As a server, I agree with the corkage analogy by which someone might pay a fee to bring in their own tea, because it is a little annoying to spend time that might be allocated to other guests preparing something that is not being paid for. However, I make my living by accommodating people, and I think that many guests would feel taken aback by being charged for hot water service. Servers live on tips, as our paychecks are usually for $0 (because of the taxes taken out of our declared tips). To me the extra effort of accommodating a guest and getting a decent tip versus the risk of them balking at the charge and tipping me badly is well worth getting them some hot water and honey or cream, despite the fact that my restaurant carries s variety of high-quality loose leaf teas. Furthermore, some people follow certain diets or have mandatory dietary restrictions; I would never feel comfortable charging a guest for tea in this type of situation, nor would I question if health restrictions were why they were doing this. If someone brings their own tea into my restaurant, I have no right to ask whether it is for health reasons or for personal preference. My message to people who bring in their own tea to a restaurant: be polite about asking, and tell the server what you need with the tea so they don't bring out cream or honey unnecessarily. Also, when tipping, consider the extra service you received that was not reflected on the bill. This type of behavior is karmatically rewarding, as you will get better (anticipated) service when you go back.