1. Police is empowered u/s 144 Cr.P.C. r/w 188 IPC, to prosecute violators for violating prohibiatory orders that are in force till 14th April. However there are certain exceptions classified as "essential services /commodities".
2. Since you are having documentary evidences of essentail commodities, in the form of Bills, you may inform the court magistrate, when called out, and request for condoning off the offence, by duly producing your documentary evidences. The same shall be considered positively, by court.
Keep Smiling .... Hemant Agarwal