Dropped iPad in toilet

Water and electronics do not make happy bedfellows. Your iPad is not designed to be water resistant. While it may survive being splashed with water if immediately dried, it will almost certainly suffer irreparable damage if submerged.

Don't attempt to use rice to dry-out electronics - as this will do more harm than good. Rice is dusty - and when it gets wet, it will expand into a sticky mess that will clog, grow mould - and retain moisture inside the device. If you must use a desiccant, only use silica gel sachets intended for the purpose - placing both the iPad and the silica gel sachets into a sealed plastic bag.

In the circumstances, you would be best advised to take your iPad along to the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to assess your iPad. If repair isn’t possible, the iPad can be responsibly recycled - and you’ll be in the best possible place to explore possible replacement:

Genius Bar Reservation and Apple Support Options - Apple

The rice thing is a myth.

Sealing it in a bag full of anything is more harmful than helpful.

It should have immediately been turned off and set in an area with good airflow at room temperature for several days.

It is probably dead.