I think this was actually a British rule, after MI5 disrupted a plot to bring down a transatlantic airliner with a peroxide bomb.

You are not remembering correctly. TSA doesn't care what kind of water it is, you take 100ml or less with you. Also I'm not quite sure, you know what the word 'machine' means.

Nice edit to the original comment btw. Makes me look like a dumbass.

Ah sorry that makes two of us then, I would of replied earlier but I had to find a dictionary to lookup the word machine. Pot kettle black lmao