This article discusses the safety of drinking hotel tap water in Japan and provides alternatives for travelers. Tap water in Japan is generally safe to drink, however it's best practice not to drink directly from the faucet and check with staff if they have any special instructions regarding their tap water before consuming it. Alternatives include bottled/filtered/boiled waters which are widely available throughout Japan. Tips for staying hydrated while traveling include carrying a reusable bottle with you; avoiding sugary drinks; and making sure you always have access to snacks such as fruits & nuts. To tell if a source of drinking water is safe or not, look out for signs/warnings about contaminated sources; check with accommodation staff; and test the source yourself using an at-home testing kit.