Diarrhoea during first trimester

Hi mummies, im in my first trimester..due to bad nausea and loss of appetite, i have been drinking isotonic drinks like h20 or pocari sweat as i cant stand drinking water. However, i have been having diarrhea quite frequently. Im not sure if it is cuz of my daily intake of isotonic drinks or other reasons. Is it safe to drink isotonic drinks on a daily and frequent basis?