I'm not trying to defend homeopathy - it's junk science - but there is a common error within skepticism to forget that homeopathic remedies need to be potentized.
Homeopaths do not claim that remedies are created through dilution alone.
Which means that when we argue from absurdity that the oceans must be incredibly powerful homeopathic remedies, we are engaging in a strawperson.
As a skeptic, I recommend against it.
Not really, if you actually read the woowoo explanations for why and how potentation works.
There is nothing magical about smacking a bottle on a horse hair pillow. The pillow and the horse hair and all aren't even catalysts there.
What is supposed to make it work is simply the energetic smack or really anything similar. That's what makes water get memory. (In their BS rationalization.) Smacking the bottle against a hard-ish pillow is one way to make that happen, but really there's nothing saying it's the only one.
There is no logical no reason why a waterfall or boat propeller or really even a water-hammer pump or even a turbine wouldn't create at least _some_ potentation. Frankly even a flush from an old style toilet should have _some_ effect. Heck, a larger raindrop hitting the pavement, or the water on the surface of a hailstone hitting the ground, or just the drops from a shower hitting the tub, should see a lot more energetic an impact than smacking a bottle on a pillow, and cause potentation, if their BS "theory" was actually correct.
And that's not even getting into stuff like, you know, remembering statistical thermodynamics. It's a gaussian distribution of mollecule speeds, and some of the collisions even in a coffee cup left on the desk will be at energies far higher than what such "potentation" can add. So basically if there was an actual phenomenon, you'd expect it to happen naturally over time in the sea or in a municipal water reservoir.
But, again, even without such advanced stuff as remembering about molecules, it should still happen naturally anyway.