Well you can either buy pre-mixed saltwater at a LFS
for 1.00/g or you can buy RO
usually .50/g from the LFS
and also buy salt and mix them yourself or you can buy a RO
and make your own water and then mix the saltwater yourself.
When I mentioned "buying water" I was referring to saltwater. If I was using 1g/wk I would probably buy it at the LFS
in a 5g jug for the 5$ and be good for a month or so.
However you do it you'll NEED roughly 22g of water and should plan for 50g.
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