The Ray Sphere was a device used by transferring the neuro-electric energy from a group of people to concentrate it into a human indevidual to unlock his/her powers. Though it will unlock the dormant abilities of the Conduit, it will kill the catalysts, and worse, cause a catastrophic explosion.
How many gallons of gas does the average mid-size car hold? The average fuel tank size for mid-size cars is 16 gallons. If the  price of gas was $3.59 per gallon, it would cost $57.44 to fill a  16 gallon tank.
It depends on the design of the toilet. The newer ones can take as little as 1.4 gallons. On the other side of things, I've seen tanks that hold up to 7 gallons. It's usually not a good idea to try to reduce that by much, the volume of water needed is part of the design, and shorting that amount can cause clogging.