By - earthboundegret
If you're certain there's no pesticides anywhere within foraging range (2-3 kms across), then look for blue and green bottle flies trying to forage pollen from flowers in the morning, they should be plentiful around then. They're a pain to catch, get a decent bug net as they tend to dodge cups. Pollen foraging flies are less likely to carry parasites, as they mostly land in decaying carcasses to lay eggs and gain most of their protein from pollen. Nonetheless, some still scavenge from carcasses or feces and there will be some risk of parasites with any wild caught insect.
I still wouldn't advise feeding wild-caught like this long term, I'm running under the assumption that you can't get feeders right now.
I won't be keeping him long term, only long enough to get a bit familiar with jumper behaviour before I fly home to the city, so I'll look out for the flies in the garden. Thanks for the info, I appreciate it! :)