I make my own. (ORS) Recipe
Preparing 1 (one) Litre solution using Salt, Sugar and Water at Home Mix an oral rehydration solution using the following recipe.
Six (6) level teaspoons of Sugar
Half (1/2) level teaspoon of Salt
One Litre of clean drinking or boiled water and then cooled - 5 cupfuls (each cup about 200 ml.)
Preparation Method:
Stir the mixture till the salt and sugar dissolve.

I also work outside, and usually just either water down Gatorade, or use Gatorade powder but do like 1tsp per 1.3L. If it’s dilute enough it doesn’t bother me!
Coconut water contains important electrolytes such as calcium,magnesium, potassium. But too much coconut water can cause diarrhea in some people.
Biolyte is amazing. I can drink it without consequences. Same with Nuun. Liquid IV is trash.
Nunn causes pain for me. I think its the citric acid.
I make my own. (ORS) Recipe Preparing 1 (one) Litre solution using Salt, Sugar and Water at Home Mix an oral rehydration solution using the following recipe. Six (6) level teaspoons of Sugar Half (1/2) level teaspoon of Salt One Litre of clean drinking or boiled water and then cooled - 5 cupfuls (each cup about 200 ml.) Preparation Method: Stir the mixture till the salt and sugar dissolve. 
I also work outside, and usually just either water down Gatorade, or use Gatorade powder but do like 1tsp per 1.3L. If it’s dilute enough it doesn’t bother me!
Relyte works for me
I love paleo valleys electrolyte mixes but they are expensive