Of course not. We are compelled to use ordinary means that is reasonably available and which can be used without causing undue damage. Today, in 21st century America, feeding tubes are reasonable.
Lactose free formula wasn’t available 100 years ago either. Does that mean you should give it to your infant should he/she not be able to tolerate regular formula? Of course not - at least not here in the US - that would be child abuse. But if you lived in an impoverished country where LF formula was not available, your child might die and it wouldn’t be anyone’s fault.
So, the questions to ask are 1) Is the food/water is still benefitting the patient? 2) will the food/water or the means of providing them do more harm than good? 3) can the food/water be reasonably provided?
Whether the patient is awake or unconscious or walking or talking are not relevant to the question at hand. We do not say that some people have lives worth protecting while others do not.