Yo , really people get way too into this. The very best thing for you, and this will work just fine. Plain water and soil. Just add store bough soil (for flowers) to any pot, put it on your windowsill with enough light. Water with plain water, no run off. See how good your results will be. It's a really overlooked and really high performance technique lol. So simple. Works. the main problem is you'll do this once or twice, get addicted then try to get into the more advance growing, i guarantee it. Hope this helps ! 🚀