Yes, you have read this correctly. Water for gas basically means that you can now use the former as an alternative for the latter. Gas consumption is at an all time high. All vehicles and machineries in different industries all over the world make use of this very efficient fuel nowadays.
Obviously, gas is a natural resource which is extremely dear. Price fluctuations are naturally expected in a daily basis. Most often than not, you can be sure that the cost of gas will be higher tomorrow than it is today.
But you need not worry about this too much