Bidet seats, How does the water connect?

Just returned from Japan and am sold on the bidet seat concept. Glad to see they are available here, but where does the water come from for the bidet feature? I looked at the spec sheets for Toto but don't see a tube going in to the tank. Will any of these work with a Crane/Rexmont wall mounted toilet or the American Standard wall mounted? Do they require professional installation?

I did spend 20 minutes searching archives, but couldn't find all these answers.

Arigato!

The seat has a tee that connects to the toilet supply line.
The supply line goes to the tee and the tee goes to the seat and the toilet tank.
You also need a 120v GFI outlet to plug the seat in to. The seat comes with a 3 foot cord so it it is usually less than 2 foot away.
Any one can install they are very easy. The electrical may be tricky.
Toto washlet seats will fit any toilet as long as it has a 90 deg angle. If you have a toilet that has a curved back us the E200.
You can go to their Washlet web site but be prepared for naked butts.
http://www.washlet.com/

The S300 by Toto fits the Glenwall. As long as you have 2.25" from the center of the bolt to the tank, you are fine.

http://terrylove.biz/12-bidet