it won't kill you but if you're unironically fasting, don't rely on magic tricks to stave off hunger. what actually staves off hunger is your body adjusting to fasting. the ghrelin spikes at programmed meal times eventually go away. first day I fasted, I was starving, weak, and shaky. by the end of the first week, I hardly even realized I was fasting (was on an alternate day schedule). The only thing that really triggered hunger at that point was being around other people who were eating and social events around food. So long as you avoid those on fasting days, you won't even notice you're fasting....unless you're eating a few calories here or there, which completely fucks it up.
also don't fall for the sodium bad meme while you're water fasting. since all you're taking in is water, you're shitting and pissing out all your electrolytes (sodium, potassium, magnesium) and that's what's gonna make you feel like shit.
also just get bouillon. better than bouillon is the best and has the most diverse flavor range
good luck, fatso