Best slip-resistant + waterproof shoes? Also, Hoka Bondi SR

Best slip-resistant + waterproof shoes? Also, Hoka Bondi SR reviews for everyday work wear similar to below? My husband works in a meat market, so his feet get wet all day, every day and he's around raw meat and chemicals constantly (when cleaning the market). He has extremely flat feet and plantar fasciitis. He's tried boots (with and without insoles) and tennis shoes (with and without insoles), but nothing has held up or stayed comfortable.