I'm currently working with DD2 on a straw cup, but until she gets the hang of it, I'd also like to introduce a sippy. Any recs for a sippy? DD1 went straight to a straw with the help of her OT. We have some Take&Toss sippies. Are those the best option or should I look for something with a soft spout and/or a valve? What has worked well for you?