You need to be a bit more clear in what you write. Is it 15-30 km per day (round trip) or one way?

If it's per day, it's not that much cycling. You really should not need an extra 1400 cals per day to support that.

No one has any idea what you do for work (so the relevance of a "12 hour day" is not at all clear). "Unsweetened" is meaningless because the calories in fruit juice is nearly all sugar. What matters is how much sugar or calories you are consuming.

We have no idea what else you are eating. If you are eating the average amount of calories otherwise (2000 cals per day is considered "average"), you are consuming something-line an additional 1400 cals in fruit juice alone!

You need to learn more about basic nutrition and metabolism. The current general concern about consuming large quantities of simple sugars is that they convert too quickly into glucose (blood concentration) and fructose (conversion by the liver into fat).

Fruit juice is really no different than soda or "sports" drinks in terms of metabolism. That is, fruit juice isn't really any more healthy than any other sugary drink (that is, fruit juice has the same problems that other sugary drinks have).

Eating the whole fruit is generally healthier because you are getting other stuff (like fiber) that slow digestion and are consuming sugar at a much lower rate.

No one is exactly "concerned". You are free to do whatever you want. Though, that you choose to do something doesn't mean it makes any sense.

You were complaining that fruit juice is expensive. Since it isn't necessary to drink fruit juice, the expense is voluntary. That is, if it's "too expensive", then stop spending money on it. If you don't want to do that, then it isn't "too expensive" (since it's something you choose to do!).

Montreal seems mild compared to NJ! What you need is to drink water. What you are choosing to do is to get that water from your food (fruit juice is food).