So here are some simple points about how to live a happier life.
1. Dont eat too much food, eat just small meals, eat twice a day
Too much food causes you to be less happy. Overeating might feel good while you eat, but overall, eating less feels better.
2. Drink 700 mililiters of water at once
This point is related to previous point. Drinking 700 mililiters of water at once is about 2 or 3 glasses depending on the size of a glass. It makes you feel better, but it also greatly reduces hunger and reduces desire for food.
Usually, person is supposed to drink about 4 liters of water per day, which is about 5 x 700 mililiters. So in a 16 hours, that would be 700 mililiters every 3 or 4 hours.
3. Dont think about past or future too much
Thinking about past means thinking about things which no longer exist, which makes you feel bad since you are either feeling bad about good things which are no longer there, or feeling bad about bad things which were once there.
However, thinking about future, especially distant future, has similar problem. If you think about a good thing you will have after 2 years pass, it makes present feel much worse. But if you think about bad thing which could happen, it again makes present feel worse.
Thus, the only thing thats left is to focus on present and good things in the present, as well as living in the moment.
4. Practice some time of thirst
Not drinking water for 8 to 12 hours can be beneficial as well, since you remove focus from problems and focus on thirst.
5. Void in the mind - No thoughts
There is a saying which goes "you cant have sad thoughts if you dont think".
Meditation, especially Tao meditation, teaches you to empty your mind of thoughts at least for some time during the day.
6. Thinking about 20 new things at once
As much as having no thoughts is good, thinking about many new things at once can also puts your focus in present and overwhelm your brain to remove focus from troubles.
I think this new list is probably the most simple one to follow.