I got a spill proof cup a while ago which cost me about $10 and DD doesn't like it at all. She just bites it but doesn't actually drink from it so I ended up getting a pack of 6 of the take & toss cups. They do leak a little which is the downside, but DD loves using them. I didn't even have to "teach" her to use it, I just handed it to her and it went straight in the mouth and she started sucking. She just takes a small mouthful at a time, swallows, then takes another mouthful and this goes on for a while, then she keeps taking mouthfuls and blowing raspberries and it becomes a game. Thankfully I only use water so it doesn't create a sticky mess.