I have spent a-lot of time researching the general subject of various plastics versus their apparent safety for food and water, and there is a-lot of opinion and passion about it.
Because of the internet gossip about the 5 gallon clear plastic containers, I had one that had been sitting on concrete for a decade.
I have water in four gallon buckets that sat all winter between the house and the green house and did not freeze. Regarding #1 plastic, the fact that it is thinner (than #2) makes it less than ideal for long term water storage.
Assuming it was safe to begin with, and assuming the seal was not broken (as ice thaws, it shrinks in size, and a broken seal could then allow contaminants to enter… the water). For example, if you leave a plastic water bottle in your hot car, then drink it after it has been sitting there for a time, chances are you will taste a bit of plastic.

If you freeze water in a plastic bottle, the only thing that will happen is the water might be half freezes and half water. Regarding #2 plastic, even though it may be considered food grade, given the controversy surrounding long term effects of leaching, it makes sense to rotate your water sooner rather than later.
They were all tucked away, unused for a few years, when someone discovered that almost every one of the unopened water jugs (looked like milk jugs) were empty or close to it. My opinion is that if you’re storing water for long term, and if using plastic containers, you should use #2 HDPE food grade. My experience with having measured the municipal water supply chlorine levels from the last two residences where I lived (I currently have well water) resulted in levels approximating 1.0 ppm or less.
When it comes to SHTF survival, the issues of long term effects from (the possibility) of leaching (even though the plastic is considered food grade) is miniscule in comparison to the need for water itself.

Although much of my water is stored in containers designed for long-term water storage, I also have a lot in two-liter bottles, which are made of sturdy plastic.
Fill them with drink & use them as freezer packs in chilly bins Since water expands when frozen, be sure not to fill your container all the way to the top or you risk cracking your container. If I added, as you suggest, nearly 70ml, I would not need a free chlorine meter, the water would stink of chlorine, unsafe for human consumption.

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