Welcome to the forum!!
Depending on the size tank you have would reflect whether you should get your own ro
unit or buy it from the pet store. You can get a water making machine for as low as $65. The good thing is you don't have to lug buckets of water back and forth either.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.