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I have a 6 stage RO unit in the Tuscany and use a 3-gallon tank. One of the stages is the ultraviolet lamp.
Small RO membranes have 50-100 gpd ratings so yes, they need adequate feed PSIG (50 psig or higher) and time to produce good quality permeate. The only on demand units have a looser membrane than the TFC (thin film composite membrane) units and don't produce as high quality permeate.
Install a one-gallon tank if you're that space limited. The RO unit itself takes a bit of room.
We had very poor-quality water on the ranch and installed softeners followed by RO when the systems became available about 30 years back.
In our homes we have on demand sodium cycle softeners with RO for ice/fridge and drinking spigot.
I was involved in the first commercial RO units to hit the markets many years ago. Worked directly with Dow on several installations and later with many utilities. I worked with the Power and Water division of GE for 35 years and was involved when we purchased Osmonics.
With the water issues around the globe the future of water treatment continues to get better each year. At the same time more water is polluted or becoming scarce as aquifer's are pumped down lowering the quality of the available water.
I grew up drinking out of the hose as well but the quality of the water today is much less.
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