There's 45g of carbs per serving

The packaging says to add 2.5 scoops to 500 ml water. That equates to 47g of powder, which has 45 g carbohydrate, of which 16 g is sugars, 29g maltodextrin. Personally, though, I make it up to be slightly more diluted than the packaging recommends.

45g

:-)

I wash out my camelbak with a milton tablet. Rinse it afterwards then freeze it. It has never smelt

Sterilise your bottles using those sterilising tablets for baby feeding bottles.

Yes I think so. I have certainly used this before several sportives and longer 60+ mile rides and it seems to have worked well. I usually drink a 500ml bottle on the way to the event along and then use a couple of bottles during the event I am no expert but this works for me