anything they won't drown in will do. i find they like it better away from the hive. i have a stock tank turned upside down by my barn. i dump water on the bottom grids once a day or so when i'm up there. they also like the mud around the water trough and salt blocks.
.....The greatest changes occur in their country without their cooperation. They are not even aware of precisely what has taken place. They suspect it; they have heard of the event by chance. More than that, they are unconcerned with the fortunes of their village, the safety of their streets, the fate of their church and its vestry. They think that such things have nothing to do with them, that they belong to a powerful stranger called the government. They enjoy these goods as tenants, without a sense of ownership, and never give a thought to how they might be improved.....
Alexis de Tocqueville