Can't I keep them in the light?
Ants get used to normal light, if they are born in artificial nests. New queens also don't begin being photophobic, if they are put to artificial nest shortly after mating flight. Only ants taken from natural nests are stressed by light (that's one of the reasons you shouldn't take entire ant colonies from natural habitat). Only don't put them in direct sunlight, as this may fry them...
How much water do I need to give them to drink?
Won't the water just mix in with the sand?
How regularly do I need to give them water?
They don't really need water pod, but their nest must be always damp. This is the most important thing in formicarium, drying will kill ants very quickly. However, as it has to be damp, can't be WET. The best strategy is to moisten only half of nest, this way the moisture level will be diverted and ants can decide in which part they want to live.
What should I feed them?
How much should I feed them?
How regularly should I feed them?
Every ants need two types of food: energetic for adult, and protein for larvae and queen. And of course a bit of vitamines and minerals, like all animals. The best energetic food is honey, becouse it is similar to ant's natural food, the honey-dew. For proteins, best are insects (proportional to ant size - small ants hunt on small prey!). Another good way is to mix honey and egg yolk - this is universal basic food containing everything they need.