Nelson, if you are out in Bethpage... you may want to take a trip to maybe a local Petco or you can go to Pets Warehouse in Copaigue... Both which I'm sure may be quick and accessible in your area.
The Petco water is made/boxed by Catalina... The other is Nutri SeaWater... or something to that effect. Petco is a cheaper alternative and approx $12 per box.. The Nutri is approx $16. HTH