Do you mean formula milk? It doesn't come in ready made cartons so you would need to either take hot water and measured out powder or take a made up bottle that has been chilled first and keep it in a cool bag and heat it when required. If kept in a cool bag it needs using within 4 hours
I used to have a tommee tippee flask for hot water. I also took a bottle of cooled boiled water out as well. For a seven ounce bottle I used to put in seven scoops of formula, 3.5oz of hot water and once all mixed I topped up with the cooled boiled water to get the right temp
Hi OP. I had a CMPA baby. If you can get nutramigen 1 formula prescribed, it doesn't need boiling water to prepare so a bit easier. I know it's a different thing to lactose intolerance but thought I'd mention it as nutramigen is lactose free too.
Whatever formula you use, I had a thing called 'mam milk powder dispenser' that was good.