I started by drinking water in front of her out of the plastic cup part. When she had seen me do this several times over a few days and had begun to get really antsy about trying to get my cup and have a go at it, I let her take a sip or two out of the cup with me holding it. She LOVED it, and would sip as long as I let her--which I monitored so she didn't start cutting back her formula. I did that for a couple of weeks just here and there at about 5.5 months, so that by 6 mos. she would be more used to water. Then, I put the lid on the sippy cup and found she couldn't figure out how to suck. So, I took the stopper out of it, and I held the cup for her, tipping it back so she would get the water. I did that for the first couple of weeks of solid food at 6 mos. to give her .5 to 1 oz of water at her meals. Then one day, I just put the stopper back in, and she picked it up and sucked it right down. Worked great for me--just eased into it with no pressure.