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I just use whatever live image I last wrote to a flash drive, because it requires zero extra effort or storage, and they all have what I would need from a rescue environment anyway.
So what would you do if you needed gzip like in my example? In this example I was able to mount the root FS of the existing system to use it but that isn't always possible.
I use full desktop live images. They have gzip, among many other things, including the ability to install more packages into the live environment's RAM disk.