Light diaper + lines punishment
 

This is loosely based on some punishments I've done in the past. As written its intended for minor infractions, but can be easily adjusted for more serious ones by just cranking up the numbers or forcing a negative modifier(s) instead of rolling for one.

Diaper up up and type “Big boys know how to follow rules.” 50 times then stay diapered 10 minutes for each line where you made a mistake.
Roll a d6 for a modifier:
1: lucky you can count the time spend typing towards your diapered time
2: luckyish after finishing you have two and a half minutes (without spellcheck) to go back and edit the document for mistakes but there are a few catches. First you must delete and retype entire lines not just fix the individual mistake. Two you must do all of your line deleting before you start typing new ones. Three since you had this extra chance the penalty for every mistaken you have at the end is 15 minutes with missing lines counting for an extra 5 minutes. So if you type “big boys know how to folow rules” that would normally be 10 minutes but its now 15 if you leave it in and 20 if you delete it and don’t retype the line at all. Read spoiler only after you complete editing.

3: you must already need to pee and poop when you start the dare
4: make the line “Unlike baby me, big boys know how to follow rules.”
5: luckyish double the number of lines but half the penalty per mistake
6: oof 2-4