I would agree with the above sentiments. I have two dogs in the truck right now behind the office.
Just bring pup to the office in their crate/vehicle, step out and let them relieve themself once or twice a day- or as your schedule allows. Throw a bumper for them. Get the pup excited about a wing. Get a frozen duck and throw it for them... praise the hell out of them for being interested and when they bring it back to you again praise them and just let them have it in their mouth. Could do dead drag drills. Leave the pup crated, pluck a small patch of feathers for a feather pile, drag the duck on a string or toss it away, go grab the pup, bring to the feather pile- command them to hunt dead, or dead bird, find it, etc. praise the crap out of them when they do find it, don't be too harsh on them for mouthing it hard and what not as a pup, just make it fun and let them know it makes dad happy. Might have to eat dinner a little late cause you stop to exercise them on the way home, etc.
One dog. Crate in the vehicle. Let them out as you can. Change your routine a bit. Build a bond.
Edit to add: unnamed person I'm close with just got two pups from the same litter, they are both stinks cause 1) owner doesnt spend enough time with each of them 2) they're never seperated 3) they spend all day together left in the house .... just a recipe for disaster and unhappy dogs and dissattisfied owner.
What you put into them is what you'll get out of it.