Hubby's sick now

It's now hubby's turn to fell unwell. He vomited and went to the toilet a few times jor. I gave him some of the medication i bought from the pharmacy yesterday and he guaiguai took some. I hope he recovers soon, as he's always been in good health. But as far as food poisoning is concerned, it attacks everyone on the same level. I'm beginning to think there is something wrong with the water supply. Many people i know is down for the same reason. Is this the same case elsewhere?