Everyone reading this has fresh water and electricity. Stop for a second and think about that. You can shower or drink whenever you want. You have lights at any hour you want. Those things should be able to make today a good day.
In undeveloped countries, millions of hours are spent getting water. Water that can likely make you sick . . but it's better than nothing.
When you day is horrendous and you can't think of one good thing . . remember that you were able to brush your teeth this morning; remember you could turn on a light in your kitchen to make your coffee.
Consider for a moment that the poor in developed countries would be considered rich in under-developed ones.