Back to work feeding logistics

Hi everyone, just looking for some advice: I have a 7 week old who is breastfed. She's been exclusively bf for the past 2 weeks - we had initial feeding problems so I had to supplement for a while.

I have accepted some work away from home in 5 weeks time. I'm a freelance performer, and the work is a paid excuse to travel to see family. I'm bringing DH and baby with me (we are both freelance). The first day of the work is what is concerning me - it's a 7 hr day of rehearsals with an am 15 min break, a lunch 1 hr break and a pm 15 min break. Ideally I would want to bring some pumped breastmilk BUT the day before we will be getting an 8 hr ferry over to the work so I don't have adequate storage - or is there a way I can safely store my milk? If not would she at 12 weeks be able to go 1-2 hrs without feeds? Her feeding is erratic atm which is why I'm unsure of what is best. Worst comes to worst DH can give her premade formula but I feel more comfortable with breastmilk if possible. Any advice much appreciated!