If you can grow fish for them then you can avoid the most difficult/expensive parts of providing a do-it-yourself diet. That is getting the essential amino acids balanced without too much of something else - like fat (the main problem with meal worms) - or being too expensive (the main problem with things like flax).
Based on the rations given in textbooks from before there were commercial pellets, I would plant clover or alfalfa for them to graze in addition to whatever else you do.
And find a way to offer trace minerals. Something like Fertrell's balancer. Or at least salt or salt with selenium added. Usually, these kinds of rations assume part of the feed will be mash and this is added to that.
This is not everything needed.
Based on the rations given in textbooks from before there were commercial pellets, I would plant clover or alfalfa for them to graze in addition to whatever else you do.
And find a way to offer trace minerals. Something like Fertrell's balancer. Or at least salt or salt with selenium added. Usually, these kinds of rations assume part of the feed will be mash and this is added to that.
This is not everything needed.