My family of five usually hikes with a couple other similar families for four day hikes each summer - one conflicts with ketofest this year Those hikes are one of the tiny steps that I have taken to going keto before I actually did commit to the keto way of eating. I was close to keto on those hikes and always felt great without the bread or milk.
Basically, I eat a lot of meat, particularly steak, but also lamb and chicken. We freeze it, some very cold and wrapped, some less cold but still frozen and some just chilled. We go raw and cook it there, but you could pre-cook it (sous vide) then freeze it and then just heat it up on the trail with a fire or a mini cook stove.
For twenty some years, we brought eggs in those plastic containers. Last year, we brought liquid eggs in cartons (frozen to start the hike) primarily because my egg count is getting high and the eggs in shells are voluminous.
Bacon, sausages and cheese are great. Butter (again, start frozen) can be added to soup mixes and about anything else.