I buy this and add it to my water. Use a little less than a 'serving' first time at it can activate your gut - maybe from the magnesium? Buying it by the bag makes it much much cheaper than liquid iv.

https://www.bouldersaltcompany.com/shop/

Since what you really need to replace is sodium, you could just make salt water. But there are a lot of products that make it easier My preferred are Salt Stick caps... It's a tablet so you don't need to taste it at all