Wood's Dairy, Creston
According to the Creston Museum's Facebook post, the dairy was owned by James Wood, who bought a homogenization machine in 1953. They were still in existence in 1961 when they placed an ad in the May 29 edition of the Lethbridge Herald.
Caps
I'm not sure that this cap can be attributed to this dairy, but the cap usually shows up in B.C. and this dairy seems the most likely contender.