breast milk drying up

I have been sick the last week and I half breast feed and half formula well since I have been sick I have slacked a good bit on pumping and breastfeeding so now I feel like I'm drying up I'm not leaking as much or producing as much. Any tips on regaining my supply? I'm going to start drinking a lot more water but I don't know if that will be enough. I need help on this. I'm not ready to stop breastfeeding and it will break my heart if I loose my supply because I was sick and slacked off.