I usually hear of smoothies pre or post ride, but as I think about my prep for a century ride (100M + 10K feet climbing), would it make sense to have a fruit smoothie during the ride? I normally carry two bottles, so I can do 1 water, and 1 for the fruit - I only blend various frozen berries with frozen pineapple, mango (from the Costco frozen fruit variety packs), and water.
No other added milk, sugar or anything else.
The night before, I plan to eat a can each of black beans + corn, I figure that’s a good slow load of carbs and protein.
Re fruit smoothie: If it works for you, go for it. The issue I see is that the fruit takes up a lot of space. All centuries/GFs I have done have rest stops with plenty of real food (if that is what you are looking for), including fruit. During the ride portion, I prefer the pre-packaged stuff (engery bars, gels) for space efficiency. Alternatives for self-supported rides include sandwiches.
As for the carb loading, you may want to check the composition - not sure that beans and corn give you enough carbs. My night prior preference is always pasta as it is easy to digest.
Sounds like a pretty big day! And yes, if it works for you keep doing it! But i really would prioritise water.
So why not focus on fresh juices? You don’t need a juicer either. Grab a bunch of oranges, melons or any citrus/veg!
For a cheap ghetto sports drink… All you need extra is a fine sieve or a nut milk bag (cheap and very useful!). Small part juice to bottle of water, with a pinch of salt. Tada you have electrolytes, some carbs and vitamins:metal: and less gunk to clean out of your bottle 
When you say space, you mean in the tummy or on the person?
I’m thinking of the fruit smoothie in the second bottle as an alternative to a water/carbo power mix, I hope that makes sense.
My mistake - I thought you meant that you were going to carry the fruit separately and make the shake during the ride. So it makes more sense now.
Definitely try it out on a long training ride first. When I do/did GFs, I definitely had some fruit at the rest stops, but I’m not sure I could tolerate a full bottle of it for its acidity. Also, most pre-made nutrition snacks have a combo of glucose and fructose (I think the recommended combo is 3:1). You may want to check on what a pure fruit-based drink would have.
Overall, my/the recommendation is to experiment on training rides. For a while, at the recommendation of my son I would make PB or PB&J sandwiches for long rides (to get real food in me). Now I’m mostly too lazy for that 
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