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You may want to bring your mother in to see her primary care physician if she is the only individual in the household tasting 'salty' water.
They are like a giant jelly treat. So, elderly people can eat them easily. They don't stick to teeth or anything. they quickly turn into water but do not burst when you bit them.
It was created by a man to keep his elderly grandma hydrated.
Just look at Jellydrops.com
Have you tried adding unsweetened fruit juices?
Cranberry juice, lemon juice, apple juice.
My Husband loved Crystal Light. I am not a fan due to the artificial sweetener but he would drink LOTS of it..
Have you tired Iced Tea or even hot tea?
I know you are trying to get 100% water into her but pick your battles. If the sweetened tea, juice, and even artificial sweetened drinks get her to drink more fluids that is a win in my book.
You can also start serving more soup as one of her meals. Soup = fluid.
Popsicles I would also think of as a fluid.
I remember back when I was using whiting toothpaste, I got a scare as I was losing my sense of taste. Stopped using that whiting toothpaste and after a couple of weeks my sense of taste returned.... whew!!
~Perhaps it’s not your water. When you are dehydrated you concentrate the salts with your saliva when you will taste salt in your mouth and on your lips!
~If mom has had Covid, this could be the after effects of the virus causing taste changes which are sometimes long lasting and other times short lived.
Geaton has some good suggestions for giving mom 'juicier' foods to increase her water intake.