Formal — to staff
Convenience · Store
すみません、お湯をいただけますか? — Excuse me, could I have hot water? (Convenience · Store, Formal — to staff, JLPT N4)
You
すみません、お湯をいただけますか?
すみません、おゆをいただけますか?
Excuse me, could I have hot water?
Romaji: Sumimasen, o-yu o itadakemasu ka? / Reply Romaji: Hai, achira ni go-yōi shite-orimasu.
Reply
はい、あちらにご用意しております。
はい、あちらにごよういしております。
Yes, it's available over there.
Gesture & etiquette
Hold up your cup noodles or just gesture towards the general area where a hot water dispenser might be.
Never pour out old water or dispose of trash in the hot water dispenser area. Dispose of trash correctly.