Look like you have just a normal drinking water filter. RO units have the water pass through an RO membrane.
In the super market look for where you get bottled water. They should have a machine that you can fill a container. Make sure it's RO water and not just filtered water.
In the long run you may want to get an RO filter because of the cost of getting the water from the super market. You can get a pretty cheap RO unit for around $120.
Cheers,
Vic
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