noun, noun which may take the genitive case particle 'no'
one bottle
Counts one bottle of something; often used with the genitive particle の to modify a noun (e.g., 一瓶の酒).
彼は一瓶のワインを買った。
He bought one bottle of wine.
冷蔵庫に牛乳が一瓶残っている。
There is one bottle of milk left in the fridge.
Compound of 一 (ひと, 'one') and 瓶 (びん, 'bottle').