During the summer months, it seems like the ice maker runs out of ice at one point or another?
I bought a case of water in plastic bottles, I took a few, opened them and took about 1/4 of the water out. I put the top back on and put them into the freezer.
Now, I had a frozen bottle of water and a problem!
Instead of adding water back into the bottle, I took a pair of kitchen shears and cut the bottle open.
I peel the plastic off - it it still going into the recycle bin - and now I have a bottle sized chunk of ice that I put into a large tumbler or large mouth water bottle.
The hunk of ice lasts longer than smaller ice cubes in your drink.
If you are doing to drink plain water, you can take that water from a few bottles - adding it to your drink - and freezing those bottles to replenish your bottle stash.
It takes a little work, but once you get a system going, it's pretty easy to keep a few frozen bottles on hand.