I use a Pur filter, so the water is always “cool” if such can be said about water in the desert in the summer.
It’s just that I get fiercely thirsty (CFIDS does that) and need ice water, even in the winter. So there are several ice cube trays in the freezer at any one time. However, I totally spaced it in my preparations to house sit, and could have come home to good, solid ice cubes.
And then, to make matters worse, I spaced it yesterday and really had to play “catch-up” by sticking a pint bottle of water in the freezer for an hour. I hate when I do stuff like this.
A very thin layer will cool the fastest.