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I've got three Oasis brand, 2 X 750 ml double walled vacuum metal bottle. Same sort of construction. The cap opening might be large enough for normal ice cubes. Ideally should be wider. I might look for some plastic tubular container, the diameter small enough to fit. Ideally the ice crylinder would fit in but longer. No idea if such plastic tubes exists? They did on the 1970s for making kids ice blocks at home.

The third Oasis a straight walled food, soup container.

Haven't used them in a summer yet. Will give your theory/practice a try. Maybe buy one of your suggested brands and see how they compare in use. Especially if 1.5 L and wider mouthed.

I'd love to see a photo of yours. Or a link to them. To see exactly what you refer to. Especially if they are up to 1.5 litres in size. What sort of cap are you using?

The icecubes, normal size? Or much larger? I assume made in a camp portable fridge/freezer.

I doubt it would work ie freezing in the bottle. But freezing water IN the bottles would mean the ice lasts longer. Topping up with chilled water. Water expands as ice so adequate space to expand means the bottles certainly could not be filled. The added water, also means there is water to drink until the solid ice melts. Sometimes too slowly!

My fears is putting a whole bottle in a freezer, say 50% filled or more, but leaving space for ice to expand. Cap off of course. The fear is the bottle might still crumple or expand and blow instead? The vacuum space, issues or not? In theory, a vacuum NO issues? One way is to try it out.

I usually like to freeze larger blocks of ice for old style drinking water containers. The old plastic insulated water containers. A nice big block of ice fitting in, lasted much longer.

The longest and best was say in the Kymberly. A very large custom made cool box with 9 or even 15 litre ice block from a bucket. Kept the caught fish, meat cool, plus beers for many days. Bring the fish and meat back to town to the freezer.

The 9 l and up to 20 l bucket ice blocks last so much longer.

Nowadays camping fridge and freezers are much more available than then.

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Absolutely correct on managing hydration and temperature.

I used to be far more able. Yound0ger, fitter. Walked 32 kms or more in 40 deg C heat on nine sips of water in Africa .... One day after a wounded wildebeest. One water bottle between six persons. A few sips and at one point a tracker refilled it in a cattle trough, 12 inches covered in slime ... All the others drank. I decided not to. Diarhorrea or worse could mean the end of the safari. Have had diarhorrea in Africa many times. A couple times seriously. Filled my hat twice with water to soak down. No shade almost at any time that day. Tough day. Thought I would be stuffed for the next day, but no, was fine. Funny,I had no blisters. The PH did.

. Wore the early first model or two of Courtneys.

Btw I could have drank the half litre of clean water in the bottle but he filled it before I realised. In the days before lifestraws type devices. 1994.

Btw as well,don't like sharing water bottles with people that have who knows what diseases, HIV, AIDS, etc. I came back from Zimbabwe with glandular fever and had it regularly for three years after that. It messed me around seriously. And gladular fever is passed on by saliva. So I want my own exclusive water bottle since then. And don't the immature ignorant drama queen PHs carry on as if it is a major ask.

Cooling using a wet hat is a good idea. I many times have filled my Akubra to douse my head and body. A light cloth scarf soaked and around the neck is also useful. Good for wiping the sweat from the face as well. I must use such a scarf one day!

I've had one or two heat episodes when hunting in extreme hot weather. Luckily one time I decided to spend some time cooling off under a shady tree. Drinking, wetting down. Getting the heart rate down. Later I realised had I not I might have had serious heat medical issues.

I remember watching the "Walking the Nile" series. One episode one young fit American guy died from heat or heat stroke walking in the heat and conditions. Such a thing can be quite possible if not controlled.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"