Go read the Disclaimer again. I am not a doctor. This is not medical advice. Seriously.
Elimination communication can be completely gear free. A baby with nothing on the butt (which is how most babies in the world spend a lot of their time) held over an appropriate potty location goes and is wiped however adults are wiped (with paper, a hand or water).
Most people with carpets and furniture aren't prepared to go quite that far. Elimination communication with back-up diapers requires whatever diaper set up is needed, plus very little else.
A few additional items can help when transitioning from being held in-arms over an appropriate potty location and being old enough to use the toilet independently. Probably the most important is a small potty, such as the Bjorn small potty or the Babywunder Clear Potty.
There are a couple books out there about early potty training/elimination communication/natural infant hygiene, one by Laurie Boucke and one by Ingrid Bauer. They're both fun to read. While they overlap, they have different focuses and perspectives.
There are a wide variety of clothing choices that aim to be more friendly to getting the kid quickly over an appropriate potty location, including split crotch pants. There are also close fitting bottoms and small underpants for when your infant or young toddler is able to reliably communicate the need to go to the potty.
When your baby is too big for the small potty, Bjorn makes a bigger potty chair.
The Baby Bjorn step stool is readily available, but it's actually a little less stable than some of the others. Even if you don't have kids of your own, it would be polite to have at least one around the house for when small children visit, so they can reach the toilet and sink.
There are several potty-seat inserts for regular toilets, some which adapt to existing seats and lids and others which are sold integral with a new seat and lid. We bought the Flip-n-Flush because it was cheap and retrofittable. Unfortunately, it isn't retrofittable with all seats, even if you get the correct (round vs. elongated) one.
A lot of books have been published to help parents and children learn to use the potty.
A General Discussion of Toilet Learning
Our Experience with Elimination Communication
A General Discussion of Diapering
A Look Ahead: Toilets and Toddlers
Copyright 2006 by Rebecca Allen.
Created February 2, 2006 Updated February 22, 2007