Your Neighbor's Drippy A/C Unit: How to Fix It

Dear Apartment Guru,

I live on the bottom floor of a brownstone. All three of the apartments above me have positioned their air conditioner window units directly above my back door. When I leave my door open for air in the afternoon, even with the screen closed, three air conditioners splash close enough that water actually comes inside. Not to mention the fact that a huge puddle is permanently gathering outside the door and I have a dog who then splashes through the puddle going in and out, bringing mud inside. If you stick your head outside, sometimes it feels like it's raining.

I don't know what to do about this problem, or even what to ask of them. They obviously want the air conditioners in the window they've chosen. But how can I reroute the dripping water of three air conditioning units. And also, is that water dangerous? I should mention, my dog has taken to drinking it.
--It's Raining When the Sun Is Out