Why didn't the husband prepare a shot of tequila for his wife?

An acoholic man finds a genie in a bottle and is granted one wish. His wish is to be able to piss Tequila. The genie grants it and the man heads home. For over a week, he gets two shot gles and shares with his wife. This one particular night, he gets only one shot gl out and his wife asks him why he didn't get her a shot. What was his reply?