Something I learned recently. There exists a 1967 international treaty that no space exploration can touch external water of any sort to prevent earth duelers from contaminating water outside Earth.
Coincidentally Outer Space Treaty has same signatories as 1994 Budapest Memorandum on Security Assurances. Feel free to look up how that last one worked out.
Getting to these planets or moons that have water in the first place is already hard, getting back from them is pretty much such a big nonstarter at the moment it's not worth thinking or worrying about.