I’ve never been comfortable with non edible ice products in an ice chest.
Decades ago my Dad starting freezing 2 quart pop bottles to use as “ice” in our ice chests, before that we’d get 10# blocks of ice which lasts a long time and he’d use an ice pick to chunk off pieces for his High Balls.
These days I just freeze small water bottles and place them around the inside of my ice chest, I think that works out to 15 cents per bottle if I’ve got the math correct, and everything stays cold. Reuse-able, cheap and easy to clean.
I don’t care which ice chest you have, pre cooling the ice chest the night before you use it, along with everything that goes in it makes things stay cold a lot better than putting everything into a “warm” ice chest.
For the fish box nothing but ice will do there… the melted fishy smelling water goes out the drain. I’d be very surprised if the fish smell could be easily removed from these re usable cubes. To that end, the user better make sure these reusable cubes are fully clean before reuse.
If I need ice I’ll buy it at Sam’s for $3.30 for 24#, I get two bags and put them in a big ice chest and then put them in one of my chest freezers at home, I usually keep a couple bags at home, or if going out for a multi day journey that ice goes into my Otter Box performance cooler for use later in my fish box.
For $47 bucks plus tax and shipping you can freeze a lot of water bottles, or you could buy the ice bags off of Amazon and use your ice maker at home to make ice bags if you want cubed ice.
Amazon.com