"Do you believe it is the government's responsibility to ensure that everyone has food and water?"
To answer your question, no. But that is not what is going on here and it is not the arguement that her "husband" and the court are making.
Her parents have said that they want to take over responsiblity for Terri, they've been begging for it. Private charity groups have offered to help out as well.
So it is not the government's responsiblity to ensure that Terri has food and water but is also definitely NOT within their authority to prevent others from providing it for her.