It is well worth paying for the AI upgrade. That way, you don't need to budget for every coffee, beer, soft drink, glass of wine etc.
The AI spirits are all OK, and there is a choice of teas/coffees etc.
You only get one large bottle of water per day put in your room, but any of the bars will give you others to take back to the room.
If you like English tea in the morning, take a small supply or your usual brand, and the same with coffee because the replenishment of the stock in the room can be a bit hit and miss. Or, there is a Carrefours supermarket in the Manar mall which is a short cab ride away, and sells just about everything!