Why do I need to administer Liquid KCL with lots of water?

Potassium is very irritating in any form. Just like you would not give it via IV push without dilution because it may cause the heart to stop, a large dose could theoretically be lethal when given PO or GT. Also, it can be very irritating to the stomach if not diluted just as it is a vessicant. Depending where the feeding tube has been placed in the GI system the dose could be directly administered where absorption to the blood stream could be fast enough for a lethal dose. Otherwise, It could trigger nausea or vomiting as a response which as well as being uncomfortable for the patient will jeopardize the intended medication and any others administered from being absorbed and having intended effects.

... A woman was fired because she didn't dilute the medication when administering via GT.

I would hope so.

I wouldn't have diluted it. I would have administered it with a meal, not on a completely empty stomach, but firing sounds harsh Unless that particular patient is careplanned for this.

Because KCl is a hypertonic and diluting to reduce intestinal issues. This is why you dilute it when administering it via G-Tube. Sometimes, when a patient has intestinal issues, you would want to dilute it when administering it orally.

Potassium is essentially liquid fire in whichever route it is administered.

I had to write an incident report on a nurse who administered PO liquid KCL undiluted to a patient with pretty bad Barrets esophagus. He had severe pain for a couple days after.

k+ has to be given with adequate water to ensure the GI tract isn't irritated or even corroded from the medicine. Same goes for peg tube. Never give a med if you don't know the reason and any other info reading the med. Fiber has to be given with adequate water as well, as does fosamax.