VARWANEO Ice Ball Maker Mold,2.5'' Large Sphere ice mold,Silicone round ice Cube Tray with Lid for Whiskey,Cocktail and Scotch bourbon

How do I get all the molds to seal? Only half seem to work.

What I need is safety, long-lasting ice making, can be used with large ice balls for all kinds of alcohol,and no leakage, suitable for family party?

How much water does it take to fill the sphere?

This whiskey ice cube is made of food grade material and,can it be reused?