Are you sure you're reading the label correctly? In order to make 4 gallons of copper solution, you need to add 4 gallons of water to the crystals.
The same for the nickel. If each bag makes 2 gallons, then you need to add 2 gallons of water for each bag.
Also, make sure it's distilled water, not water from the faucet or bottled water, or well water.
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