Kirk here. Here's a map showing three locations (Kumamoto Port, Yatsushiro Port, Misumi Port) where the Japanese Coast Guard is offering showers, pure water, phone charging, and other support.
https://twitter.com/JCG_koho/status/722210490735169536
For details in Japanese see
https://twitter.com/JCG_koho/status/722210201835671553
海上保安庁 on Twitter
“【海上保安庁のお知らせ】19日の給水等支援場所は図のとおりです。 #支援情報”