Short trips when I’m jigging mostly but will dead stick for last hour for crappies I have used a large size Gatorade bottle. Works fine for crappie minnows or fat heads for a few hours. Around Winnipeg they sell minnows at some gas stations in 2 liter coke bottles. Otherwise I use a Coleman water jug for longer trips but I’m usually have heat at some point to keep from freezing a lot.
I use a coffee thermos when on trips in with my snowmobile. I’ll refresh the water once in a while with lake water as needed. I’ll put ten sucker minnows when out for lake trout or a small scoop of fat heads in it for other trips.
Thats similar to what I use. Mine may be Igloo brand. Just be sure it has a spout on top, makes a great handle to help open if your hands are frozen and can’t grip the small grooves on top.
I use a super small cooler I think like 10 x 8 x 8 it works great for keeping minnows even a scoop or two fit in there the lid can get sticky but never froze shut for me yet.