Measurements of noncount Uncountable Nouns

The bag of flour which we bought a month ago is over empty/finished/used up.

I'm buying a box of candy in the shop.

To sow some seeds, I/we/they need {or he/she/one needs} a can of corn. {Strange sentence: A can of corn is already cooked, so why would you plant these kernels (not seeds) of corn?}

Mom, where is a the jar of jam?

I see jars of jam in the refrigerator.

At night, the breadshop {better: bakery} is open, you may buy a loaf of bread for/at a low price.

Sir, I would like a glass of water please!.

I want some water. Can/Could {more polite} you bring me a cup of coffee?

I usually eat a piece of cheese and a slice of bread in the morning.

My father usually buys a bunch of grapes and bananas after_hours.

How much does it cost a bottle of oil cost in UK? {Otherwise, it sounds as though the bottle of oil is paying for something.}

I need to buy a carton of apple juice at the shop on Somoni Str.

Measurements of uncountable noncount nouns