There are many roles that the Nile river played in supplying Egyptians with food. The river gave fish for example.
The Nile River.
Because it was close to the Nile river, so there was a steady supply of water, and it was great for immigration.
because Nile River provides them water supply.
they live off of animals and of course the nile river water supply
The Nile
they provide egyptian foods and egyptians plants.
The link below will supply some pictures.
I'm guessing that the White Nile is called the big long river because it is the longest out of the other one, the Blue Nile. However, the Blue Nile provides roughly 2/3 of the Nile's water supply.
Nile River
It provides about 60% of the Niles water.
Egypt has only one river - the river Nile, the longest river in the world.
The link below will provide photos.