What kind of filter do I need for my well water?

We have always just bought gallon jugs of water. Turns out the stores are limiting it to 2 per customer because of the shortages. This is an issue as we use that much in one day.

We can’t drink the well water we have. I haven’t had it tested but I can tell you it smells strongly of sulfur, it’s orange/rust in color, and has floaters that can visibly be seen. The house does have a water softener (we put salt in it every so often) but it doesn’t help much.

I’d like to purchase an under the sink filtration system to make the water safe to drink. What kind of filter should I be looking into? I’ve heard of reverse osmosis filters but I don’t know much about it. Any suggestions and information would be much appreciated!

*We rent so putting in a whole house system isn’t an option. Too expensive for a home we don’t own.