11m old milk issue

I have a little bit of a problem.

There is a few days in August that I have to be away from my son who will be 11m old. Only day trips but one day every weekend. I can't pump enough to make sure I have plenty of milk for those days... realistically, is it okay if he gets a little less milk on those days and fills up on more food than he normally does? I don't want to supplement if I don't have to but will obviously. I think I can pump 12-15oz for each day, is that enough to keep him going for just one day?

Please no rude comments... I'm already stressed enough for this...

Edit: I ebf 95% of the time, I'm not sure what he's really getting

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