I drink a gallon of water everyday. Is there a real benefit to this or.....

You must be big. Sounds like your trying for water intoxication. But be warned, you won't need to worry about waking up with a hangover if that happens.

There is guy in my cousin workplace who drink water All day so he can take many toilet break, and he just drink more and more water so he can have longer longer breaks

But even though these boss guys suspect his plan to get away from work, they cannot stop him because you cannot say 'stop it, stop drinking water now' because of peoples human rights

So this guy just get to go for toilet breaks and do what he want, like use his phone, or read a book, and no one can stop him.

My cousin think this guy is genius type guy and says he will also use this plan one day, but not in this workplace because would be too obvious

I’m not sure if that much is necessary or not depending on your activity level.

Too much water is not healthy. Overhydration is actually dangerous. It can cause an imbalance of salt and other minerals in your body. It can be fatal.

https://en.m.wikipedia.org/wiki/Water_intoxication

That's way too much, and yes, you're overworking your kidneys.

A gallon = 16 cups, which is twice as much as the classic rule of thumb (8 cups of water a day), and even that old rule of thumb has been misinterpreted by most people. It doesn't mean you should literally drink 8 cups of pure water per day, it means your total intake of water should be about 8 cups per day, and much of that will come from the food you eat. For example, cooked meat is around 65% water, so if you eat a 1-pound steak, that's over a cup of water right there (10.4 ounces). Most fruits and vegetables are around 90% water, with some being as high as 99% water. So if you're drinking a gallon of water a day, plus the food you eat, that's something like 20+ cups of water a day, which is ridiculous.

In any case, you don't need any guidelines because your body has a built in mechanism to make sure it gets the amount of water it needs; it's called "thirst". Drink water only when you're thirsty and you'll be fine.

I had to convert gallon to metric but I think it is too much. I have had kidney stones in the past and have been told to drink 2 litres (half a gallon) a day to help prevent that happening again. Too much water can cause it's own problems.

That’s a lot! I strive for 3 litres, which is just over 3/4 of a gallon. It’s what the beauty advice people suggest. It’s supposed to help the body detox, plump up the skin soothing out wrinkles somewhat, add a glow to the face, keep unnecessary snacking and overeating down and other health benefits. You’re a lot bigger than the average woman and so I’d think a gallon sounds safe enough.

I find it difficult to get past 2 litres and that’s not including my 2 cups of coffee or my huge smoothie or the H2O in food. I just feel so full and then I have to go find a bathroom if I’m not at home.

Do you have to keep getting up to pee at night? Or do you cut off drinking early?

I drink water like crazy when the temperature is elevated, just naturally. A gallon does seem like a lot. Have you been generally healthy over the time? I have a notion that a lot of mystery illness is actually just dehydration caused by people simply not drinking enough water.