She had nothing to eat except drink water
She had nothing to eat except to drink water?
She had nothing to eat except drinking water
Are all the above sentences grammatical? IF So, What is the difference between those sentences?
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In the first case, you're saying you've had nothing to eat, except something called "drink water". As far as I know, "drink water" isn't the name of a food, though I could see someone adopting it as the name for some sort of alcoholic water product ("drink" as a noun is used to refer to alcoholic beverages).
In the second case, you're saying that you had nothing to eat, other than some water to drink - you're providing an exception to the verb, by linking another verb in (not sure what the formal name for this grammatical construction is). An example of something similar would be someone who's counting money at the end of a business day saying "there's nothing left to count, except to tally up some electronic transfers".
In the third case, you're saying that they had nothing to eat, except something called "drinking water". Drinking water is a well-known noun phrase used to refer to water suitable for human consumption, so this works grammatically.
However, as some of the comments have pointed out, you would typically say "nothing to eat or drink" in this context, since you eat solid foods and drink fluids. That said, even native speakers don't speak English perfectly all the time, and this would be within the bounds for someone speaking (though generally not writing, except in written depictions of characters speaking).