I dont have this one, so I can't personally recommend it, but it is cheap, and the reviews are ok. The downsides with this is the flow rate is around 2 gallons per hour, so the flow rate is very slow. The reviews also say some people experience leaking issues, but I mean for 70 bucks, it's pretty good. Definitely do your research though on this, because some filters create a lot of waste water. My RO filter makes way more waste water, than usable water, so make sure you have a good location for it. If you for some reason can't get a RO system, find a local place you can go to. Never use tap water again. Not worth the risks.
AQUATICLIFE Aquatic Life RO Buddie Plus DI Four Stage Reverse Osmosis Deionization Unit 50 GPD
https://a.co/d/ctfG7hd