YOU SAID:

first put three cups of flour into the water

INTO JAPANESE

最初に3カップの小麦粉を水に入れます

BACK INTO ENGLISH

first put 3 cups of flour in water

INTO JAPANESE

まず小麦粉3カップを水に入れる

BACK INTO ENGLISH

Add 3 cups of flour to the water

INTO JAPANESE

小麦粉3カップを水に加える

BACK INTO ENGLISH

Add 3 cups of flour to the water