Ok. Yes, unfortunately, as others have said, someone setting that up for you puts them at serious legal risk. If you find someone willing to help you, make sure you leave a note stating clearly that you are the sole person responsible for the set-up and infusion.
I think the volume of the N is too large for an IV "push;" that is, I think you'd pass out before you were able to inject all of it. I mean, even if it's only 4 oz total, there's not a syringe big enough.
So, the only option is an IV drip set up. I'm sure there are videos (probably for nursing students) on YouTube; watch a couple of demos, and if you still want to do it, I'll be happy to walk you thru it.
I can even tell you exactly what supplies you'll need.
Fair warning, though: you're still going to have to stick yourself, with either a butterfly needle or an IV catheter. You're also going to need a 250 mL bag of saline solution to put the N in; that's what will flow thru the IV line.
This really isn't something that's a beginner skill level, but it can be done. Still, it's an awful lot of trouble to go to for something you could drink.
I guess if the taste is just completely unpalatable, you could drop an NG (nasogastric) tube to your stomach via your nose or your mouth and push the N in with a Toomey syringe, but the biggest ones are only 60 mL, so you'd hafta be quick.