Ld50 Of H20
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This calculator for the lethal dose (toxicity) for caffeine reminded me that even water has an LD50 https://en.wikipedia.org/wiki/LD50
Intraperitoneal Mouse LD50 (for water): 190 g/kg
Intravenous Mouse LD50 (for water): 25g/kg
The alt.drugs FAQ has info too on LD50