Found this page with some interesting sound loops:
https://www.soundsnap.com/tags/lapping
The one that I think more fit for our needs is the one called 'Rocky lakeshore, small waves lapping - quick and bubbly'
The following SFX are nice too, but they come with some squeaky/chirpy sound (as cricket's calls) which are a bit out of place for our model:
https://freesound.org/people/Benboncan/sounds/82058/
Tomorrow I will look for other sounds, in the meanwhile let me know about the ones above
