Well... using tap water might actually help, as long as you prepare it properly. At least leave it sitting out in an opened container for 24-48 hours, shaking it around a little bit whenever you can. Killfrenzi mentioned something about that earlier, you should check the ph of your tap water and consider watering with that a little bit instead. Also Epsom dolomite lime is pretty cheap, I think my garden store has it for around $4 per bag, and a bag will last you quite a while since you don't want to overuse it. The epsom salts contain a neutralizing agent, as well as the calcium and magnesium that you're partially missing out on by using the dasani bottled water. Neutralizing agent will counter act the acidic soil in a timed release way where you'll need to continue to check your soils ph, and mess around with adjustments from there. There is a lot more to be learned about this ph/nute relationship but that's a long and detailed discussion, so I'll refer you to a link in "Basic Growing" that should explain most everything you need to know about it. Its called something like "Understanding ph balance......" and so on, and its pinned to the top of this section of the forum. Check that out, and let me know if you need me to elaborate on anything I mentioned above.

Oh and sorry no, I cannot yet tell if its a male or female. I wouldn't stress over it too much, your plants might be able to sense that and become stressed as well hahaha. It is what it is and only flowering can reveal that for you. When you're ready.. you will see the answers to your questions, young grasshopper.