Add visual symbols when a structure need water/electricity

[Lumina]

Some structure's description don't mention the need of water/electricity and even if the details could mention it, i found it confusing when you try to build something and realise only later that you would have placed it elsewhere. So i think it could be better to add some symbols so it's more obvious. For example :

Blue water : clean water

Green/yellow water : contaminated water

Lightning : electricity

This way you could clearly see if a building require a specific place.