What hacks do you use to make your life easier? My recent cooking hack is air fryer. I can air fry tasty veggies like broccoli, cauliflowers, etc in 10-15 minutes. My next car maintenance hack is to put in a Fumoto oil drain valve.
I don't know if this counts as a hack but the most recent one revolved around a trash company that overloaded itself and could not pick up trash for a week. I temporarily stopped using large trash-bags and instead put trash daily into disposable shopping bags. It turns out I can fit about 60% more waste in their garbage container using disposable shopping bags than I can using the 30-39 gallon bags. This might be useful for people that rent two or more of the garbage containers. To list all my hacks would need a blog.
I used to have one listed in my profile but I removed it for lack of interest and nuked the VM it was running on. I maintain it locally and may put it back online some day.
Fasting and OMAD. Eating only once a day fixed many issues I had (physically) but also helped me continuing eating the way I like: until I'm almost exploding. It turns out doing it only once a day is quite healthy.
Practicing (ie. trying to the improve skill of) fasting. I have the best results when I start after lunch and drink bone-broth on the fasting days; I treat it like a improvable skill, not as an exercise in sheer willpower; fwiw my record is 15-days.
You're question is kinda rules-lawyery. It would break a water fast. Joe Cross fasted for 60 days on vegetable juice and made a movie about it; he lost 100 pounds, but yes its not a water fast, but that's somewhat the point of my comment, that there's more to fasting than simply not eating.