J.P.
I have 4 small kids, I work and I homeschool them. I know busy.
You HAVE to eat and drink enough water to keep you out of the hospital for an emergency c-section for pre-eclampsia when your kidneys and liver become too overwhelmed to work properly. Would you starve your 1 year old or not give him water because you are busy? Then don't do it to your baby.
Set a timer for every 30 minutes and go take in 4oz of water. Have it all ready by the timer. The night before, after your 1 year old is in bed, prepare your food for the next day - it might take you 15-20 minutes to prepare....but then you'll grab it the next day and actually eat.
Good luck. We moms know how hard it is...and once the little one is born, it does not get any easier as far as time....so prepare your foods and drink your water. Your unborn baby with thank you.