Hi Maurosacchi. Personally, I would be looking at PP with glass/carbon fiber. Extremely strong and PP works well with liquids. Make sure when you print that the z seam alignment is at random. And I would also print it with 100% infill. Final version anyway.
If you do want to go for PP, make sure you use the adhesionsheet and/or pp-adhesion from Magigoo. Those are the only adhesion solutions which worked for me when I used PP with GF (30%): XSTRAND™ GF30-PP (Polypropylene + Glass Fiber) (crea3d.com)
Sounds like a very interesting project, SandervG forwarded this thread to me. :)