Anyone familiar with flat soft drink production? Lemonade to be precise!

This is a long shot but I know how crafty beer brewers are! Currently making THC infused lemonades ( Legal State ) however the facility I now work for wants to scale up to produce approx 1875-4000 gallons per month. I am trying to solidify the beverage production process to produce a safe shelf stable product and also to figure out exactly what equipment will be required for production. This will be canned 3rd party. any help or information pertaining to this would help tremendously. Currently producing and using potassium sorbate as inhibitor however that does not kill only prevent. I assume pasteurizing is a must for this to be stable 1 year.