A friend sent me this photo, evidently taken at an apartment building on Calle Galiano. As the story goes, residents didn't want to join together to pay a modest fee of 150 Cuban pesos, or about $6 each, to buy a large water pump that would send water into all the apartments. So residents went their own way, with some buying their own pumps so they'd have a better chance of getting water when it is delivered to the building.
Water in many buildings in Havana doesn't flow from the tap at all hours. It's only available at certain times and then it's a mad scramble to get the precious liquid.
A Google search showed the same photo was published on the website Conexión Cubana.