Nothing comes up with a web search for Matter Magic that is usefull in determining what that product is. A better description of the product, a better name, something that tells us what it is would help.

The poster is growing 'maters' with mater magic...

"Mater Magic is derived from Meat Meal, Hydrolyzed Feather Meal, Bone Meal, Blood Meal and Sulfate of Potash 5-5-9 plus 4.5 calcium"

I haven't encountered ants in containers myself, but others have suggested boric acid baits, diatomaceous earth, also submerging the containers in a larger container of water (holding it down if necessary) until all pest have drowned then letting it drain and dry out again.

"Mater Magic" contains some stuff ants would find tremendously desireable which probably explains why they took up residence in the buckets. While there are numerous strategies to use to kill various insects taking steps to keepthem away is often the best and that might meant not using products that would attract them.