Does the deepcool tesseract sw support water cooling?

Based off this image:
633a68d411b946698316278821a08c4b.jpg

Perhaps not though with some creativity you could get it to fit up there. In essence any 2x120mm fan mounts will accept a 240mm radiator setup but in your chassis's case there is a small separation between the two fan mounts up top.

Here's a build log you could look into:
https://pcpartpicker.com/b/7KLD4D

^ Shows that the fans will get in the way of any motherboard connector, rams or power delivery heatsinks on the motherboard so a couple or a lot of factors need to be considered.