For beer, get ORION or Sapporo brands than Asahi brand. But if you love Asahi, look on the bottom of the factory, and avoid codes of the factories that are using water from contaminated are:
Avoid H: Fukushima B: Ibaraki Y: Kanagawa
OK S: Nagoya U: Suita P: Nishinomiya D: Shikoku

H→福島工場　（福島県本宮市） B→茨城工場　（茨城県守谷市） Y→神奈川工場　 S→名古屋工場　 U→吹田工場　 P→西宮工場　 R→四国工場　 D→博多工場