Thanks so much for the tips! Luckily it seems my RO model also has a designated lining for sale so I should be ok on that front:

https://www.amazon.com/gp/product/B00N5D7ZFW/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1

I'm thinking about getting a permeated pump so that the water pressure is high enough, do you think this is necessary, or would it be overkill? I know it's a lot to ask, but if you have the spare time, would it be possible for you to skim through my refrigerators manual to see if there's anything that blatantly stands out as being incompatible with the RO? I'll look it over myself but I'd rather have someone a bit experienced look at it just in case. It's fine if no though haha

edit: Okay so this is what I found:

"The water pressure must be between 20 and 120 psi. If the refrigerator is installed in an area with low water pressure (below 20 psi), you can install a booster pump to compensate for the low pressure. If a reverse osmosis water filtration system is connected to your cold water supply, this water line installation is not covered by the refrigerator warranty. Follow the instructions carefully to minimize the risk of expensive water damage. If a reverse osmosis water filtration system is connected to your cold water supply, the water pressure to the reverse osmosis system needs to be a minimum of 40 to 60 psi (276-414 kPa or 2.8-4.2 kgf/cm², less than 2.0-3.0 sec. to fill a cup of 7 oz or 198 cc capacity)."

I'm assuming I need the permeated pump to meet these requirements?