*sigh* a common strawman, I'm afraid.
For a start, homeopaths don't usually use water in their dilutions. It's usually lactose or something. I don't know exactly what.
Actually, they do use water or alcohol. Hence the whole water memory argument they use.
The fly in the ointment are the solid pills, which do end up using something like sugar, lactose or whatever as a base. But that doesn't mean it's dilluted directly with that. They'll still succuss the active substance (say, caffeine for sleeping pills) with water, make a solid pill of that solid stuff, then basically wet it in the diluted solution.
Really, succussing directly with a solid wouldn't work very well, if you read about the prescribed ways to succuss.
Generally the only substances which are just ground with lactose are those who are simply not soluble, hence there would be no point in trying to succuss them in either water or alcohol.
Needless to say, semen is pretty well soluble in water, as my... extensive empyrical experimentation in the teenage years showed
Secondly, and more importantly, water does not acquire a memory unless it is succussed. This is an essential process, without which homeopathic dilutions are not considered effective. So Tim Minchin's line about "it somehow manages to forget all the poo it's had in it" does not apply to "real" homeopathy.
Not necessarily. See again the grinding of unsoluble solids with lactose, which is considered to be just as good. But really there was never a coherent theory (even using "theory" in the loosest sense) that absolutely required impact against a padded board. The "theory" is merely that some energetic shaking or stirring is needed, and that board and horsehair pillow is merely one way to do it.
I don't see why flushing the toilet wouldn't activate at least _some_ of those "healing energies" in feces, really. Or why pissing off a bridge into a river wouldn't be energetic enough to cause water memory. Even, again, going strictly by the homeopaths' rationalizations.
And since we're talking semen, hey, let's just say that some energetic shaking might have been involved in how it ended up in water in the first place

Or I'm pretty sure that the impact of splashing against the tub or toilet bowl would cause _some_ memory.
But even if you insist that that padded board is really needed... hey, I don't ask about your fetishes, you don't ask about mine. What I do in the bathroom with a leather pillow stuffed with horse hair is nobody else's business
There's plenty to criticise in homeopathy without resorting to straw men. The "homeopathic overdose" is another example of a strawman argument. Let's just stick with placebo-controlled double-blind tests and not resort to arguments that homeopaths can easily dismiss, hmm?
On the other hand, that never stopped me from engaging in the ancient ritual known in initiated circles as taking the piss. The whole notion is so ridiculous, that you can't have enough piss taking.