Putting thawed milk in a pitcher????

Hey y’all. So I’m gonna be going away for about 20 to 24 hours while my son is being watched by a family member. I exclusively breast-feed but I’ve been pumping once a day to save up a stash for the trip while I’m gone. I have it all in the freezer right now but when it comes to the day that we leave, is it a safe thing to do to thaw out all the milk for a the 24 hour period and put it in a pitcher for my family member to just pour into bottles throughout the day while we are gone? Or should she just pour the singular breast milk bags into bottles throughout the day? All of my bags of breast milk have different amounts ranging from 1-5 oz in them so I’m thinking using a pitcher would be easier!! TIA for any advice!