I use cat food with vanilla and liquid smoke on it. I use a funnel to put it in smaller containers that fit in my pocket.
I'm refilling 2 of these in batches. The smaller containers keep my hands free to multitask.
I'll take older leftovers out on the line too and drop pieces down the chute if I run out or don't want to make a batch but this gets messy and tedious. I usually squirt a lure like vanilla in a line away from the trap into the game trail.