1. Grasshoppers: the 4" beasts that I find in the garden. Freeze, chop, and feed. Its great for the larger neps.
2. Termites: At least once a year, it rains and the next day all the winged termites come out and land in the pool. I skim them out, roll them into balls appropriately sized for the pitcher, and drop them in.
3. Mosquito larvae: Similar to the termites. Just scoop 'em, roll 'em, and into the pitcher they go.
4. Ants: I discovered these when I had a few neps in a makeshift mini greenhouse outside. I'd have whole trails pouring into the pitchers on my N. mirabilis x khasiana. The pitchers all filled a solid 1/3 way with ant carcasses and the plant grew from a rooted cutting to 2 feet in a few months.
5. For the little neps, I use fruit flies or termites left over from feeding the tarantula spiderlings.
Peter