NO.
JUST. NO.
This is VERY dangerous method. Here is why. By you working on a desperation rather than actual slow training, you can irreversibly DAMAGE your bladder, and cause significant pain or worse. No fantasy should ever have to involve the pain like this. There is a much safer, gentler method rather than "One shotting"
Does tea and gatorade help you go? YES. But this is called a dare for a reason. Also, remaining in your wet diaper for to long can lead to VERY painful rash. Forcing masterbation as part of the dare is also not a good idea, for people who dont want to have the sexual connection to diapers. It also can bloat you if you drink that much liquids so quickly. This can lead to significant stomach pain, or as stated above, worse. This is NOT the way to do "Detrain" it only lasts a little bit.
SO,
HERES HOW YOU REALLY DO IT.
1) Wear diaper
2) Wait, and evrey so often, use your diaper how it is intended, but never force.
3) Drink as normal, do not dehydrate. Be patient.
4) Your brain will do the rest and relate diapers to wetting.
5) Thats it.
Not only that, but if you decide it isnt for you, then you can retrain yourself. This is the pain free method I used also to train my brain to fall asleep to lullabies. If you relate it, you dont have to hurt yourself. Again, YOU SHOULD NEVER EVER FORCE.
...You been warned. Weather you heed that warning is up to you.