Do what ants normally do except in a close contained area/environment, they make ant farms so you can see the ants and what they do since it normally all happens underground, and ant farms are see...
Depending on where you live, you should be able to find ants at a specific time of the year, when the young queens fly. If your farm is big enough, or if you built a custom one from an aquarium, then...
They like tiny bits of fruit or vegetables. But make sure they are very small amounts because the last thing you want in an ant farm is moldy food. Ants also appreciate a drop of honey, some sugar,...