The Book of Akbar (Shaykh Ilāhdād Faiḍī Sirhindī) 7.2.6

7.2.6

but there were two or three immense reservoirs, in which the (rain) water was collected and stored from year to year, and amply sufficed for the requirements of the garrison. In the dwelling of each officer of importance there was a separate reservoir, containing a sufficient supply of pure water for his household. Nor had all this preparation been made for the occasion ; it had been kept up from the foundation of the fortress. The rulers of the country had incessantly cared for the strengthening and provisioning of the fort, more especially in respect of artillery. The revenues of several parganas were specially and separately assigned to keep up the supply of artillery, so that the officers of the department had independent sources for maintaining its efficiency. The population in the fortress was like that of a city, for it was full of men of every kind. After the surrender, the inhabitants came out, and there was a continuous throng night and day for a week.