Using a neti pot with tap water may be dangerous or deadly if the water is contaminated. Experts recommend distilled or boiled and cooled water.
Neti pots provide sinus relief without much danger when used correctly - Grand Forks Herald
A Woman Who Died From A “Brain-Eating” Amoeba Used Filtered Tap Water In A Neti Pot
Can You Drink Distilled Water? Is It Safe?
Rare Infection Prompts Neti Pot Warning - The New York Times
IS RINSING YOUR SINUSES WITH NETI POTS SAFE?
Looking for Nasal Congestion Relief? Look for a Neti Pot
How to Clean a Neti Pot: 2 Simple Disinfecting Methods
Man dies of brain-eating amoeba possibly after rinsing sinuses with tap water : NPR
Neti pots are great for sucking out snot. It's also very unlikely they'll kill you.
Nasal Irrigation Michael Rothschild, MD
Is nasal irrigation safe or even effective in kids? — THE PEDIATRICIAN MOM
Seattle woman dies from brain-eating amoeba after using Neti pot with tap water