Dude if you can't find perilite, order some, you NEED it. Also get some clean sand to add to the soil (construction sand is best), this will help your drainage. As for where to find perilite, try home depot, lowes, or maybe even walmart. But if you cannot find it, use a bit more sand in the mix, about 2 - 3 more cups

I add 6 cups of sand to every 4 gallons of soil mix, same amount of perilite.

lots of luck to you.