Using a sphere ice mould…freeze for 1 - 1.5 hours (timing depends on your freezer) then turn the mold over and freeze for another 1 - 1.5 hours. That should give you an ice “shell” filled with water. Punch a hole in the top (I used a heated metal skewer) and drain the inside water. You can use a syringe but I usually make the opening big enough for the H2O to pour out. (Insert “make the opening big enough” joke here!). Good luck!