The high cost of gas is making drivers look for another way to run their cars without spending so much money. Now drivers would want a resource that is easily available, will cost less and can be guaranteed that it will not see any escalation of prices.
Water appears to fit this description very well. Right from the start, it is the resource that costs least and will be available. This quality means if you use water for gas, you will not have to contend with any increasing prices of gasoline. You fill your tank with cheap resource and run cheap.