is it possible to loose weight by a water diet?

Hello i did read a fasting diet related to water diet and it looks defferent, it adressed for weight loss, what i don't know is it safe or not, because it looks verry hard to do, here is the diet description : here 

i don't know if it is saf, i realy need a diet, to loose weight, i wanna take advanage of this quarantine to reduce my weight is possible to do or not.