Fucking with the laws of physics -> other gods WILL notice and promptly de-existentialise your shapeless ass.
Also, well has water, its like impossible for them to break.... they'd float... unless you like chuck them against the well wall and have them break on the well wall slipping out the contents...
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You quickly scurry into the humanoid tent and do many return trips, grabbing books and the vials, freely chucking the books into the well whilst uncorking the vials and dropping them down into the well, mixing their contents with the water, on the last trip some weird robed person spotted you, but you managed to outrun it.
You then go and find some more food to chuck down into the water to rot, making it more likely that the villagers will get sick.
And in one last effort of chaotic evil, you chuck yourself down the well, resisting the primitive instincts that still remain in the animal and kill yourself.
You exit out of the now lifeless monkey-reptile, having successfully jeopardised the well.
Hopefully they don't realise till its too late!
You feel very glee-full and race off at full speed back to your contaminated valley.
Back at the valley, you spew more evil energy into the land, the ground is now getting blacker, the water is also becoming grey, the air has become heavy, thick and of a darker shade.
You then find the nearest animals.
Your choices of a new avatar are:
a.) Strange colourful bird
b.) Another of those monkey-reptiles
c.) GODZILLA RAWWWR (actually a gecko...)
Or last but not least
d.) A rather giant stick insect.