My daughter refuses to drink any water that isn't stone cold! She needs a sports bottle type for school, that doesn't leak, but she also likes the water to 'flow' into her mouth rather than having to take really small sips. She likes the Systema twist n sip because they are easy to drink from, but they don't keep the water cold enough for her. Has anyone found anything like this? I am wondering if the Thermos Funtainer is any good...has anyone tried it? How easy is it to drink from?