Japanese · Pronunciation Guide
mi-zu, two even beats. The zu is a buzzed "dz" with completely unrounded lips.
mizu
Two morae of matching length, and in standard Tokyo speech the word is unaccented — the pitch rises from mi to zu and simply stays there, so a following particle rides high rather than dropping. Nothing about it should sound emphatic.
Listen: 水
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水がとても冷たいです。
Mizu ga totemo tsumetai desu.
The water is very cold.
Listen: 水がとても冷たいです。
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水がとても冷たいです is a nice test because 冷たい (tsu-me-ta-i) starts with つ, a single affricate rather than t-plus-s, and ends with a vowel sequence a-i held as two separate beats. So the sentence asks you to keep mizu even, then articulate a genuine tsu, then resist collapsing "ta-i" into an English "tie."
The dominant error is lip-rounding on the u, producing "mee-ZOO." Japanese u is made with the lips flat; rounding it changes the vowel's colour completely. Learners also tend to stress the second beat, turning the word into an English trochee-in-reverse. Both beats are equal, both vowels are short, and the lips never pucker.