Or just throw a few spoons of table salt in the bottle as you're filling it. It'll dissolve readily enough.cobby wrote: ↑Tue May 24, 2022 6:09 pmUse the water from the bay. Salt water is slower to thaw than freshpurple5ive wrote: ↑Mon May 23, 2022 9:42 pmAh yeah i meant frozen water bottles when I mentioned ice blocks, my bad.
Ill give it another go in the insulated fish bag now rather than the zipperless esky I had before...
Cheers
Salt actually lowers the freezing point while reducing the time it takes to thaw out, so it makes your esky colder but for a shorter period.
100g of salt in a liter of water will lower the freezing point to roughly -6C.