No worries.......I personally use 3" rockwool cubes placed in a nursery pot half full of hydroton, then I cover it with more hydroton. I get these products at a hydro shop 2 hours from my house or online. The easiest thing to obtain to grow hydro in would be vermiculite or perlite, which you can buy anywhere that has gardening stuff. Read the growfaQ (if it's working today) and it should instruct you in the proper use of the perlite/vermiculite mediums.......I have never used them.
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And don't be letting my son leave Advanced Nutrients empties all over the place....that's a dead giveaway!!