These are two different graveywards along the highway. The tradition is to clean them and decorate the graves with orange or yellow marigolds on the Day of the Dead to welcome the spirits of the dead back to the family for an annual visit. Water is also left at the graves for the spirits because they get mighty thirsty on their journey from the parallel world where spirits live to this one as they come to visit their mortal families. Mom wonders if it is bottled water? The cemeteries all over Mexico are very busy for these two or three days. Graves are cleaned of weeds and brush and litter. Everything is tidied up and beautified with flowers. Nobody wants their dead granny mad at them!