Try it!
In PowerPoint, you can put a text background in your slides to get that watermark effect.
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To add a watermark to all the slides, Select View > Slide Master. Scroll to the top of the thumbnail pane on the left, and select the first item, the slide master.
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Select Insert > Text Box, and then click and drag to draw the text box on the slide master.
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Type the watermark text (such as "DRAFT") in the text box.
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To change the alignment of your watermark text, click and hold the rotation handle at the top of the text box while you move your mouse left or right.
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Select the text in the text box. Choose a light font fill color, and then make any other changes that you want to the font and style. (If you do not see the Format tab, be sure you’ve selected the text box.)
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Exit Slide Master. All slides except title pages will have the text.