Prices and Amounts

noncount nouns
How much is the milk? (Price)
How much milk is there? (Amount)
How much is the water? (Price) -- It’s 69 cents (for) a bottle.
How much does the water cost? -- It costs 69 cents.

count nouns
How much are the cookies? (Price) -- They’re $2.29. (Two dollars and twenty-nine cents.)
How much do the cookies costs? -- They cost $2.29.
How many cookies are there? (Amount)