Not a doctor, but I can think of two possibilities:
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Some vitamins and medications are water soluble, so taking them with water helps make sure it all gets into your system instead of being excreted.
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2L isn't very much for a full day. People are different, but even 2.5L/day is a little low for many healthy adults. This may be their way of getting you to make sure you're staying hydrated but framing it as a health necessity rather than just a recommendation. Even without the medication, 2L is probably a bare minimum for most people.
You can probably sue the state for things that are actively harmful, like creating dangerous roads. But a lawsuit trying to set different priorities in revenue and spending isn't going to get very far. Setting tax rates is fundamentally political. That's the entire purpose of a state legislature, so the remedy is at the ballot box.
TBH, I wouldn't want a random selection of unelected people from my state (a jury) to be able to have the power to decide tax rates.