You should drink more water.

你应该多喝水。

You should drink more water to relieve your fever.

你应该多喝水来缓解发烧。

Anna: Then you should drink more water.

安娜：那你就该多喝点水。

You have got excessive internal heat and you should drink more water and cool tea, or you will suffer canker sore …

你看你都上火啦，你应该多喝些开水，凉茶，不然很快就会口腔…

When you have fever, vomiting or diarrhea, your body loses additional fluids. In these cases, you should drink more water.

当您出现高烧、呕吐或者腹泻的时候，体内的水份大量流失，这种情况下，您需要摄入更多的水份。