I grew up there in the sixties. Regular ingredients came from the local market (this was before supermarkets) who typically sold regionally grown produce. We supplemented with home and allotment grown vegetables which were shared around the neighborhood. The food was great. Tinned food was quite expensive and generally considered an unhealthy novelty best used on camping trips - I’m looking at you fray bentos, you and your weird deliciousness.

https://flathub.org/ is a great way to manage linux apps/programmes. Very easy and several other benefits