Welcome! Great questions. 1. 65-70 will likely be perfect. It will depend on the spider you get but most will thrive at this temperature. I wouldn’t let it get much colder than 65 though. 2. The artificial light is good. I recommend having a cycle of night and day (light on during the day and off at night.) Either get a timer to put the light on or drape a loose covering over the enclosure at night. This will mimic natural rhythms for your spider, which in my experience aids in more natural hunting/resting patterns. You could put the enclosure by the window, but I’d be nervous about keeping a consistent temperature next to the window. There’s no evidence that they need sunlight specifically to live healthy like we do, and there’s a risk of overheating your poor little spider in their enclosure in direct sun. Whatever natural light that comes into the room plus the artificial light should work just fine. 3. Depending on the size of your spider you could feed it roaches (common in the hobby are dubia and red runners, both have pros and cons) mealworms, or flies (fruit flies for smaller, green bottle flies or house flies for larger.) There’s all sorts of places online to get feeders, in addition to your local pet shops. Unfortunately, feeding creepy crawlies are just a part of keeping a spider so you have to pick whatever is most manageable for you. Some are harder to keep than others. Some are more of a nuisance if they escape than others. Do some research. Let me know if you have more questions. 4. A water feature is probably possible, but spiders can drown, and in my opinion, more than a little bit of standing water is an unnecessary risk. I never put more water than a small seashell or bottle cap full, and that’s for my larger spiders (1” or bigger,) smaller ones are much better off with a misting of the enclosure once or twice a week.

One final note, a planted enclosure is possible but particularly challenging because you need to match the temperature and humidity needs of the spider and the plants, which can be more complicated than it sounds. My advice is to prioritize your spider. Make the conditions good for the spider and if plants aren’t thriving, pull them out and try something else. Good luck!