I would not call this one (below) the best thread, but it is recent and in light of what is happening. The rest I think I did a "DIY feed" or "cheap feed" and "feed per day" type of search, but I didn't bookmark them. However I'll poke around some and post more links in a while.
https://www.backyardchickens.com/threads/if-feed-stores-closed-and-you-can’t-free-range.1352377/
There are also a lot of threads on making one's own feed too.
In the mean time, I posted on the linked one above, like I did here maybe ....I dunno.....20 pages back? This thread grows so fast!
So I searched how much feed per bird per day and found general estimates to be about 1/4lb to 1/3lb per day for a laying hen to produce an egg. Or about 3lbs a day for my birds, and feed wise I'm ok for about 60 days.
But in the light of the changing situation (and that we are a family at risk) l decided to start rationing more strictly by the weights suggested AND I'm stretching what I do have adding in things like:
-Garden scraps (I do this anyway)
-kitchen scraps (again, normal here)
-small amounts of hand picked forages. My outdoor run is muddy right now because of record rains and flooding here. When things dry a bit I'll make a chicken "pasture" just for the girls to free range to boost nutrition.
-I've also started adding some eggs back to their feed. I've done this before in times of just too many eggs and did not notice an appreciable drop in egg production, however it did stretch my feed by about a third even though that wasn't my goal at the time.
Right now I have a dozen girls all currently laying, and in the mornings I've started adding 6 to 8 fresh eggs (shells and all) to a portion of the daily amount of dry feed. Mashing well so I don't encourage egg eating, and waiting about 10 minutes for the pellets to swell and soak up the moisture, then feeding it and some plain dry pellets.
I've basically taken the average daily amount of 3 to 3 1/2 lbs of just feed and reduced that to about 2 1/2 to 2 3/4lb per day with the egg addition alone. Every little bit helps.
I'm tracking production and condition and will assess as the grass comes in more and I'm able to free range them more. Grass is really starting to come in patches but the mud and flooding has set back forages here as many places are still in standing water. Or mud.
Note: I'm not stingy. I have given thousands of eggs away to friends and neighbors over the years. Some are thankful, most are not. In my current location ignorance abounds and I've not been treated well for my egg offerings, so since I'm WELL stocked in eggs right now I can easily give them back to the the birds.
ETA: Sorry... SnapdragonQ and "brief" are not syno