Say "it is water", politely.
水です
みずです
mizu desu
です is the polite copula — "is / am / are" — and it closes the sentence. The plain form is だ (da), which is too casual for a café.
due 2026-09-24 09:57Z · stability 2.31 · difficulty 2.12 · 1 rep · 0 lapses
1 review
“水です。”
state before this review: new · stability before 0.00 · scheduled 3 days, to 2026-09-24 09:57Z
Evidence is the tutor's one-line justification, written with the grade (review_logs.evidence). “Needed a hint three sessions in a row” is the signal that the card's notes or answer need work — the loop the authoring chat is for (EXAMPLE-LESSONS, “Authoring feedback”).