The total horse he owns is 5+3= <<5+3=8>>8.
The total liters of water each horse consumes is 5 + 2= <<5+2=7>>7.
So, the total water all the horses consume every day is 7 x 8 = <<7*8=56>>56.
And the total of liters of water they consume every week is 56 x 7 = <<56*7=392>>392.
Therefore, the total liters of water they consume for the entire month is 392 x 4= <<392*4=1568>>1568.
#### 1568