Yeah I actually dealt with something very similar. I too have long, healthy, thick hair that became very dry and gross after moving somewhere with hard water. I recommend buying a water filter for hard water, I bought one from amazon for $25 You can also use an Apple cider vinegar rinse to help clarify your hair. I recommend using shampoos and conditioners that do not have silicones or sulfates, as silicones prevent moisture from entering your hair cuticles and sulfates are drying. I have been using indie shampoo and conditioner bars for years that don’t strip your hair of their natural oils. Any try to wash your hair only twice a week. My hair feels pretty much normal now mostly because of the filter and the acv, but avoiding certain hair products is also important.
https://www.amazon.com/gp/product/B01L94O060/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
I use this one. There's people posting reviews showing tests being done on the water with the showerhead applied saying that it works.
From the time that I've used it I can say that it's pretty good.
For your face you can also just boil the water, or run it through a water filter like a brita and that'll also work.
I’m not sure how handy you are but this shower head filter works really well for my sister. She had the same problem, no hair products worked, but actually just softening the water before you put it on your head fixes the root of the issue.
https://www.amazon.com/Water-Softener-Shower-Head-Replaceable/dp/B01L94O060
If you have hard water get a water softener nozzle attachment. It helps immensely! I had the same issue and feel like my hair is bouncing back when i do my treatments
If you have hard water, you can get a shower attachment to help! https://www.amazon.com/Water-Softener-Shower-Head-Replaceable/dp/B01L94O060 It’ll help immensely! They have them cheaper too
There are water softener attachments for your shower!!
https://www.amazon.com/Water-Softener-Shower-Head-Replaceable/dp/B01L94O060
I’ve seen them cheaper but as a general idea, it’ll help if that’s your only issue!
They have a filter built into the head, either in line or underneath. Much like a whole house system, just smaller scale.
https://www.amazon.com/Water-Softener-Shower-Head-Replaceable/dp/B01L94O060
There are water softening shower heads like this. I can’t vouch for this one, but it’s worth a try.
San Diego has really hard water.
https://www.sandiego.gov/sites/default/files/2020_annual_drinking_water_quality_report_online.pdf
The only real way to treat it is with a water softener, but you're not going to be able to install one of those in your dorm. If you have your own bathroom (or shared with only your roommates), you could try a water softener shower head but honestly, I have no idea if they work.
https://www.amazon.com/Water-Softener-Shower-Head-Replaceable/dp/B01L94O060
You can also get shower heads with filters on them, like this one from Amazon
I was seeing that this works to filter out chloramine in case the water sticks one doesn't work! Thinking about buying it myself.
I’m not sure where you are but hopefully you can open this link and it’ll show you
https://www.amazon.ca/Filtered-Shower-Head-Softener-Eliminates/dp/B01L94O060
Water Softener Shower Head - Hard... https://www.amazon.com/dp/B01L94O060?ref=ppx_pop_mob_ap_share here is the amazon link! seriously look at the comments and stuff it’s pretty amazing