Talk to me like I’m stupid pls

Okay so I am 25F 200 pounds now. I desperately want to fast but I cannot figure out the right electrolyte combination. At this point I can’t fast past 1.5/2 days without severe muscle cramps in my legs and I have a job where I am constantly running on my feet and I have to not have brain fog as I am in leadership and need to make quick sound decisions. Every time I try to fast I get so frustrated with these symptoms, the hunger is something I can deal with but not being able to do my job is a dealbreaker. Someone please give me the simplest most effective way to be able to get my electrolytes. The combinations I have tried … instantly leave the body no matter how small of a sip I do.

Are there premade packets that have ALL of what is needed? Thank you in advance 🙏🏼🩷