Sort:  

The one I linked is really good, install is not that bad.

https://www.amazon.com/APEC-Reverse-Osmosis-Drinking-Water/dp/B00I0ZGOZM

I had a glass out of yours been thinking about getting one but dont know how long ill reside in this rental

You can take it with you, the only thing done in install that cannot be undone is the hole in the sink drain for the drainage of the system. That can be easily covered when you move out.