If your kids are pestering you that they would like to keep ants & you do not want to spend too much money,just in case it's a fad.
Well this could be the answer a budget form of ant housing,which comes with a escape proof wire mesh vent,and magnified feeding bowl, which simply pushes into the rubber port.
The photo shows one that I use your will come with no decor,you are just getting the empty housing.
The easiest method for you is to get hold of some playpit sand, which clumps together well, for your base
Use a toothpick to start a couple of tunnels off before you add the ants,this will encourage them to go where you wish.
Also wrap some black card/materiel around the bottom if the ants see too much light they will tunnel away from it
EMPTY HOUSING NO DECOR INCLUDED.