Answer:
it really depends on the birds them selves. one time i had 2 parakeets in the same cage and there was only one food and one water container and and there wasn't a problem with them fighting or anything but i did end up putting 2 food and water containers in because i was having to re fill the containers a lot but even then they still liked to eat and drink out of the same containers. so i guess it just depends on how well Ur birds get along.