I vote for electrolytes. I know lots of peeps say you don’t need them for fasts under 72 hours, but that’s not true for me.
Also, what about your carb intake? Like, you’re definitely going into ketosis. It wild suck to go into ketosis while fasting. It’s easier to already be on ketosis when you go into the fast.
So, if you’re eating normal people carbs, then entering ketosis during your 2 day fast, you’re peeing out a lot of electrolytes, and getting the keto flu and your body is sending out all the hunger hormones, begging you to eat carbs again.
In my opinion, it might be worth altering your diet going into the fast to help improve your chances of breaking through the 48 hour barrier!
Before my fast begins, I spend at least a day prioritizing fat and protein over carbs in my meals. A body that’s running on carbs is running on sugar. (I am not shaming you saying this, it’s just what bodies do, they break down even the complex carbs in veggies into simple carbs to fuel your cells.) It’s the dips in blood sugar that make me ravenous, I find; when a body that’s running on sugar runs OUT of sugar, it signals your stomach to start demanding a top-up. The hunger pangs can be positively painful. But if I have my body running primarily on fats/proteins, that blood sugar crash doesn’t happen! Breaking down fats/proteins into available energy takes more effort from your body, so it takes longer, which means that you don’t get the post-meal blood sugar spikes (that precede the crashes!) like you do with a carb-based diet.
I’ve been practicing therapeutic fasting and fasting for weight loss on and off for years, after a great deal of reading, and this has been my experience! YMMV!