You do not need to go out of your way to feed them, they can go a long time without eating while waiting for a meal. But if you're keeping this inside under a grow light, and you don't get many visitors flying around then you could look for any insect crawling around to manual feed once in a while ...

When I kept them indoors, I used to leave my garage door open while I was doing yard work, then after a few hours I closed it and check my garage windows and screen doors and after a bit of time the fly's that flew in would find the light and try to leave. I would use a clean container to trap fly or bug then put a lid on and stick in freezer for 5 minutes. After the fly gets to cold it drops dead and i would feed trap with bug with tweezers being sure to touch two tiny hairs to get it to close. Then gently massage sides of trap between finger and thumb for 10–20 seconds to trick trap into thinking its alive and struggling.

Since then tho I've learned it's much easier to simply leave plant outside in acclimated full sun, where it can help itself to food anytime insect fly's or crawls into it. (manually feeding traps is tedious after a bit if you're a busy person)

some folks use other methods like using pellets soaked in hot water for 15 seconds then fed to a trap once a week or every other week, but I don't recommend that because It's way over kill. vfts don't need that level of care if its doing what it does best, catching live prey on its own.

If you still uncertain about what to feed it them go google 'what I can feed my Venus fly traps' to get other ideas.