Funnel Fitting 16 or 20oz Poland Spring Bottle

This was a funnel I developed to use with a bottle of water and need a shaker to mix the protein. It was intended to use when I was on the go when I didn't have or trust a water source and did not want to carry around a bulky shaker that then needed to cleaned. I am planning a remix in Fusion 360 to thicken the walls when I get some time. I encourage any other remixes to make it better.