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I’m not saying it can’t be done, but such wholesale elimination of particular food groups such as meat, fish and dairy, is stringent enough, and has severe enough effects, especally on people’s systems who are unused to such fasting, or who are compromised by things like the incresingly common diabetes, that it shouldn’t be undertaken without medical advice is all I’m saying.** Just vegetables and water? Sounds very strict. Make sure to consult a doctor before undertaking something like this. **
This regimen is typically observed by devout Orthodox, Byzantine Catholics, and other Eastern Christians for the 40 days of Lent and other times.
Fish is allowed on Palm Sunday and Annunciation.
It CAN be done.