As the others have said MAC, it's some achievement to have got so far on your own; calendar events are
usually more sociable and that can help a lot.
It also proves that your training is working; you've found something that you need to work on.
I struggle with nutrition on audax and I find skimmed milk or milk-shakes and pork pies are really good
for me if I'm using a supermarket as a control. In cafes I opt for beans on toast with an egg on top.
On the bike I eat either Bounty bars or Jelly Babies for a bit of a treat and I usually have a couple of gels if I need a boost. I keep this stuff in my jersey pockets or a top-tube bag so that I nibble as I ride along.
Good luck with your next rides and keep us informed
.