The litter box is the bane of a cat lover's existence. Your Cat is a no-nonsense online guide to teaching kitty how to share the rest of the family's bathroom facilities. The procedure involves raising the litter box and moving it over the toilet. Next a metal bowl with litter is inserted under the toilet seat and the box removed. Gradually the litter is removed.
Water goes in the bowl.
When the bowl is removed, Kitty's using the toilet. The author says it only took her Misha two weeks before she was thoroughly reliable. Always keep the lid up and the seat down. Take it slowly, moving from litter box to toilet in tiny steps, allowing your cat time to adjust before you make another small change. Accidents indicate you should back up a stage or two and try again, slower.