Weaning toddler

I feel terrible.

My daughter just turned 2, and up until now I've been putting her to sleep with a bottle every night, well now I'm trying to get her off the bottle, so I gave her some warm water in a bottle instead and put her to bed with it.

My poor baby has been crying for the past 2 and a half hours, it's now 10:00, I dont know what to do anymore, I feel so guilty.