i mean yeah it's basically just water, why the fuck not?
i do the same with margarine, so i never have to be caught with an empty packet and no backup.
because butter is expensive as shit and it doesn't taste that much better, and i'm pretty sure the idea that butter is magical is to a significant degree just dairy industry propaganda.
margarine is fine, cheap, and doesn't rely on an industry that exploits and mistreats animals, so i see no reason to use butter.
Lived in the middle of nowhere and the nearest grocery store was 25 miles away. Once every 4-6 weeks we'd go to town and get maybe 10-12 gallons of milk, a shit load of bread, and all the other stuff.
Milk in my country get pasteurized and heated to a very high temp for a short amount of time. Unopened it stays fresh for a few months that way. We keep like 10 packs or so in the cellar.