Can I make the shakes up in the morning and then have it at lunchtime or do they need to be made fresh before drinking? If I can make it up, do I need to refrigerate it? I’m using the diet, banana flavour if that makes a difference? Any advice greatly appreciated 
I made a shake yesterday morning and put it in the fridge.
This morning I took it out of the fridge and put it in a backpack. I’ve been out hiking and I drank it at 6pm. It was fine.