I can see why they looked similar and why some people mistakenly assumed you were re-asking the question because you didn't like the previous answer:
- One is a travel tech question, asking if any system exists that does what reverse osmosis does, for people travelling across North America and elsewhere
- The other is written like a travel tech question, asking if any system exists that does reverse osmosis, suitable for this person travelling across part of North America
...but looking at it more closely, I think the difference is:
- One is a straightforward: "What sort of technology achieves this standard of water quality"?
- Answer: Reverse osmosis, with example
- The other appears to be: "I was trying to solve a travel problem using a reverse osmosis system, but I've run into a snag because of incompatible valves. How can I get around this problem?"
- Possible answer: some sort of valve adapter, allowing a standard reverse osmosis system to be used anywhere
- Possible answer: some service providing pre-filtered water refills, eliminating the need for the reverse osmisis system (without causing lots of plastic waste)
- Possible answer: some alternate reverse osmosis system with a more flexible attachment system
It's more of a problem solving question than a travel tech/gear question, so I've edited the title to make that more obvious and I've voted to re-open it.