Coolant Loss

The jug is probably cracked right there at that fitting look carefully with a flashlight sticking right on top of the jug and on the side the bottom front you'll find it I doubt things are leaking past the clamp. Usually the plastic of the jug is compromised

 

It looks like it may be and the system does make a certain amount of pressure so you want to keep an eye on it when you get it warmed up going somewhere for a while whatever and see what you have going on If it is leaking from pressure you need to get it replaced a cheap aftermarket one can be fine It's a Gen 3 so it's not going to be around that long no worries on cheaper parts the cheaper the better with this car actually better doesn't improve the car's chances per se.

 

Perhaps a new hose????? There reall isn't much to trim back and reattach.
And a new cap? That will likely stop the leaking. If not, you could remove the tank, clean
it really well. Then fill the tank and put pressure on it to find the leak. Then heat
an old screwdriver or something metal and melt the place(s) where the leak is.
Or purchase a new one....

 

You use non-springloaded clamp on coolant system. That is the most common cause of leaks. Spring loaded OEM clam expand and contract as the temperature changes. If the hose is not cracked, than just replace the clamp. Otherwise, replace both and the leak will never occurs anymore.
Always use OEM "spring hose clamp" on any car. There is a reason why Tesla, and all ICE cars still use this spring.
https://www.huyett.com/blog/hose-clamp-types

 

Rearranging deck chairs on the Titanic?

Oil Catch Can Update, 2013 w/ 199K | PriusChat

^ 190k+ acquisition with clogged EGR and broken damper plate twixt engine and transaxle.

 

Some of these cars seem a perfect candidate for o-ring removal and zero pressure coolant It's for big trucks and it stinks real bad I can't remember the name of it We were using it in the '80s and some Toyotas but basically you change your cap and the stuff runs zero pressure it just gets pump through it doesn't need the pressure for the added boil protection if you will I guess.

 

Any update? Did you find what was leaking? Were you able to fix it?