Mix 1 ounce of dry crystals with 1 gallon of water. After about 2-4 hours the crystals will have absorbed their maximum capacity. Dump out the excess water and your crystals are ready for use.
This video does not use the amount we gave you above, it is just for demonstration purposes. When it comes down to it, you can use as much water as you want and dump out the excess when your done. If you don't put enough water, you can always add more.
This is a good video demonstrating how fast these beads will grow. This video takes place over about 2-4 hours.