I tried using my bottle warmer yesterday (have been using hot water in a jug) but I thought it didnt work so I threw it in the bin. Went into Boots baby room today to feed Roo and needed to use the bottle warmer; that's when I realised you have to put water in it, what an idiot!! Bin men were due today so I had to phone home for someone to dig it out of the bin bag before they took them. How stupid am I?? I must say though, how brilliant are they??!! I got mine for £1 from a car boot sale and it's the best £1 I've ever spent!