Where can I find the replacement straws for this product please? It doesn't very environmentally friendly if we have to buy a whole new bottle every time the straw is bitten or broken... Is there a similar product with easy to buy replacement straws? Thanks

Are there spare nozzles?

What can I do to make the underpressure go away when I drink? because it pulls the straw in after every sip. Very impractical!

Does the child have to bite at the straw for anything to come out?