Best foods to boost milk supply in those early days..

I am having my baby on Wednesday I hope .. getting induced Wednesday anyway! I breastfed my last baby for 14 months but had to supplement with formula from about 8 months. I always had a low milk supply issue. I am expressing (by hand as i used the pump and im getting nothing) and ive managed to get about 6ml of colostrum frozen in case he has low sugars (I have GD). What foods can i eat that will boost my supply? Is there any bars or snacks i can make? Help?