Sorry for the late reply.
What you eat the day and night before will power your training/race day.
I would stay hydrated with an electrolyte drink and maybe have some light snacks that have carbs. Cliff bars were nice. But, cheap granola bars burn the same. So do cookies.
Anytime I ate a meal within 2 hours before training/racing, I was subject to feeling sick. I had no problem eating whatever I wanted an hour or so after training/racing. It's important to eat a good meal to help replenish what you depleted on the bike. Electrolyte drinks or supplements helped me in the evenings as well.