expression, ichidan verb
fill a bottle; bottle
Used when putting something into a bottle, often for storage or preservation.
手作りのジャムを瓶に詰める。
I fill a bottle with homemade jam.
彼はワインを瓶に詰めて販売している。
He bottles wine and sells it.
Standard kanji spelling for the expression.
Kana spelling for 瓶 is common in everyday writing.
詰める alone means 'to stuff' or 'to pack' in general; 瓶に詰める specifies the container as a bottle.
Compound of 瓶 (bottle) + に (particle) + 詰める (to pack). The expression is transparent from its components.