On this quick but very useful video Jen Swedhin shows you how how to create a watermark brush in Photoshop by using custom text and making a reusable brush. Swedhin uses Adobe Photoshop CS5 for this video but you can do it much the same way in newer versions of Photoshop.
Iddo Genuth 
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I’m using Photoshop CC 2015. I created the watermark brush no problem, but it will not drop when I place it on the image. It’s stuck to my pointer!
My Bad – chose Brush History – not Brush, All good, thanks for the great vid.
Hello,
I just released my Watermark-Panel. It’s for free and supports CC/CC2014/CC2015. Check it out: https://creative.adobe.com/addons/products/12780
It would be great if you can rate it and write a few words about it on Adobe Exchange.
Thomas