How long will homemade beta fuel last in the fridge?

Hey all,
I started mixing my own beta fuel this year and it’s been great. In an attempt to save time and effort I began making mega batches of powder mix every week or two and saving it in a huge tub. But I want to be even lazier (because mixing bottles each day is definitely not marginal gains for recovery when I could be sitting more often)
But in all seriousness, how many days would a mixed bottle of malto/fructose (with a pinch of Gatorade powder for taste) last in a bottle in the fridge? I’d like to make several bottles at once and store them in the fridge just for simplicity, but I don’t know how long before they might turn…funky. Anyone know a good recommendation for how long they can sit mixed in the fridge? Cheers!