If you are trying to get rid of the supply, I would just do a few multiple feedings. Offer the mouse just like you would normally do. After the first mouse is down and once the snake has started moving around again, offer the second mouse just the same way that you did the first. Repeat as much as needed. There is nothing wrong with offering multiples, but doing it all at one sitting is generally best. After all, if you are feeding every three days when do you get time to handle the snake