Please share your experiences, good or bad, with maintaining supply while travelling without your EBF infant!

Our family has the opportunity to go on a trip this August and we’re on the fence whether to bring our then 3 month old. It’d be a largely outdoor trip and we have concerns over how he’d handle the heat and humidity. The trip can be cancelled, but not postponed due to financial/logistical reasons. I’ll have enough of a freezer stash to leave the baby with a relative for the four days, but I’m worried that my supply could take a permanent hit while he is so young. I didn’t leave his brother for that long until he was nearly a year old. I’m also trying to come to terms with possibly needing to pump and dump while away unless I figure out a way to travel with unfrozen milk