you need to use peat for the potting media, even regular potting soil still has some neutrients in minerals in it that will kill the plant, remember these plants grow in bogs with little to no neutrients in the soil, The plant must only be watered with RO, Rain, or Distilled Water, never tap water as the salt and mineral content will kill the plant. I dont know where you live, but if you provided us with better information, we could help you out...The USDA map only shows to zone 11, i dont know where this "zone 15" stuff is coming from either....Sarracenia need to be grown in full sun, so if you cannot grow it outside because of the insane heat, maybe you should stick with indoor CPs like Pings, Drosera, Nepenthes, Heliamphora, Utricularia, etc. Also Sarras, VFTs, and some temperate Drosera and Pinguicula need a winter dormancy, so unless you can strap multiple T5 lights above a growrack in a garage or something, you might be SOL as far growing Sarras....if it really gets that hot outside in the summer.
Edit: Also, i have never seen an extremely dry hot part of Northern California.........what part are you talking about?!
i highly recommend picking up a copy of Peter D' Amato's book titled "The Savage Garden"