"bunch" is used two ways, here.
It is used to describe a group or gathered amount. Bunch of flowers is bouquet of flowers. Bunch of bananas is the group of bananas you might pick up at the store, since they don't come one at a time (individually)
"Bunch" can also mean "many" or an large amount.
There is a bunch of kids at the beach.
Grab a bunch of cookies and a glass of milk.
That recipe called for a bunch of garlic.
Is there bottled water available?
Is there a bottled water in the frig.
Are there bottled waters in the frig?
Are there bottled waters available for the trip?
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