Yes, you can, Noexcuses2020,
By the way, 100 oz of water sounds like an awful lot! If you did more than you would have done otherwise, you are ahead of the game because you challenged yourself.
Me - I did figure out how to add words to a JPG in canva. So that's a step closer to my goal. The next step is to try to use what I made in KDP's cover creator. At the moment, I can't get into cover creator. I got an email asking me if I'd changed anything in KDP, so I probably can't get into it because they think I'm a hacker. I procrastinated all morning, and now I will try to get into cover creator and use the photo with the words I added. If I can do that, I'm ready to host my contest. For me this is all very challenging and frustrating. Okay, here goes.