This is an ice block made from frozen water from my water bottle.

Step 1: have a plastic water bottle.

Step 2: fill it up with water.

Step 3: make sure the lid is on tight.

Step 4: chuck it into the freezer for two days or longer if desired.

Step 5: remove water bottle from freezer.

Step 6: acquire skissors.

Step 7: cut off the top of the water bottle, it's easier said than done.

Step 8: remove more of the water bottle to only the bottom half

Step 9: use warm/hot water to melt the ice just enough to make it pop out (don't full on melt it)

Step 10: fling it back into the freezer, you now have an ice block with the indention of a water bottle, congratulations.