Who said "Water fits any vessel. A single drop, a whole ocean."?

Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Earth (The Five Scrolls).

What is the original Japanese?

水は方圓の器物に隨ひ一滴となり、滄海となる。. Translated from the original Japanese by Spartan Surfers.

Water fits any vessel. A single drop, a whole ocean.

Miyamoto Musashi, The Book of Five Rings, Earth (The Five Scrolls)

The source

"Water fits any vessel. A single drop, a whole ocean." Miyamoto Musashi said it in The Book of Five Rings, Earth (The Five Scrolls). Translated from the original Japanese by Spartan Surfers.

"水は方圓の器物に隨ひ一滴となり、滄海となる。"

Original Japanese, The Book of Five Rings, Earth (The Five Scrolls). Japanese: Gorin no Sho transcription (1939), NDL digital text.

Who said it

Miyamoto Musashi (c. 1584–1645). Undefeated swordsman who wrote The Book of Five Rings in a cave a few weeks before he died.

Questions

Who said "Water fits any vessel. A single drop, a whole ocean."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Earth (The Five Scrolls).
What is the original Japanese?: 水は方圓の器物に隨ひ一滴となり、滄海となる。. Translated from the original Japanese by Spartan Surfers.