I dropped a 2 liter soda bottle on my left foot and it's swollen day before yesterday started hurting yesterday and getting swollen and red?

A 2 liter bottle weights 4.4lbs. This is a significant amount of weight to drop on a foot. The force could have caused a fracture or torn a ligament. I would suggest that you go to an urgent care facility that has the capacity to do an xray and have your foot examined and imaged. Delaying treatment for a fracture can cause significant problems in healing and long term foot/walking problems.

If there was a wound created by dropping the bottle, I'd be concerned about an infection. You should see a physician immediately to evaluate for infection and possible antibiotics.