You could have some food delivered and answer the door without getting dressed.
Give yourself an enema.
Clean every room in your house. If the diaper leaks before you finish, add another layer.
Each hours roll a die, the amount you roll is the glasses of water (or other drinks) you need to drink for that. Do this for 6 hours starting when you put on the diaper, have fun waddling around in a very wet and soggy diaper
And by the way good to meet a fellow diaper lover, there aren't that many here!
Edit: if your roll 4 or higher two yes in a row you may half the rolls (rounding up) for the remaining rolls. This to prevent you from drinking to much in a short time