you could probably go to a pet or aquarium store and buy the charcoal that they put in fish tank filters...I'm sure it would work very well...you would just need a way to mash it up into a powder and add it to spring water and bingo you have carbon blast....probably the same way someone got rich. It would be very easy to 5 gallons of it for $10 and they sell a quart of it in the store for $9