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I have this drinking system for my daughter with special needs. The first picture is the straw with a check valve at the bottom that makes it a little easier for her to drink. The problem is, when the straw ends up angled right, you end up with a siphon and it just keeps dribbling out on her. A bite valve is problematic because she has pulled it out (chewed it off?) And it becomes a choking hazard.

I don't remember the exact size of the check valve or straw tube off the top of my head (a standard flexible staw is the same).

Can anyone recommend some alternatives for a bite valve that don't come off easily? I know the check valve is hard to pull off. Please feel free to suggest other subs that may have better insight