pink toe and mexican red kneeWell, its kind of up to you. At that size, you can prob keep them in the vials they come in, with some moist substrate. Feeding either chopped crix, pinheads (if slings are appropriate size), or flightless fruitflies.
What species are we talking about here?
Just keep the soil a little damp. at that size you won't want them drowning in a water dish anyway and they are getting most of their water from their food. The damp soil just keeps things humid so that the fragile spiderling does not dessicate. I like to keep a syringe on hand for dripping the water down the sides of the vials.also for water what sould i do about that.