Based, forget all that bullshit other people are telling you about showers and jobs, that's irrelevant, the trick to locking down a BPD woman is first you have to peak their intrigue. I suggest playing that misogynistic Scott Pilgrim song really loud on some earphones so everyone near you can overhear it and then hanging around places BPD's like, like tattoo parlors and dildo shops. It shouldn't take long before one of them hears the song and squeaks "OH MY GOD, THAT'S LITERALLY ME". That's your cue to take out the earphones and say something like "Haha I know right, I can't believe that guy thought his song was a diss".
Now, chat with her. You've got about ten or fifteen minutes before their low empathy flood of personal validation dopamines wear off and she decides you're actually a creep, so you have to work fast, but it's important they don't sense you rushing. Keep it breezy, keep it casual, it doesn't matter much what you're saying as long as you keep the smalltalk going. As soon as you get into a conversational rhythm it's time to strike ; this is when you tell them you're actually out smurfin for fed and ask them if they want to smurf a few boxes with you. If you're socially awkward you might strike out a few times on the delivery here, but it's no big deal, just find another BPD hangout and try again.
BPD women generally cannot resist a man of danger and mystery, so if you get far enough to ask her to go smurfin you're now officially on a date and you've got her undivided attention for the next few hours. Take her to every pharmacy in the area and take turns buying a box of sudafed inside. Ask her a few questions about herself and let her talk herself out. Don't tell her anything about yourself, or your opinions, or your beliefs. If there's a natural opening to do so, make sure you drop an implication that you're a fuccboi and you have a lot of weird fetishes, but don't tell her what they are. Get shy if she asks. Make her work for it.
From there you'll have keep up the air of mystery until you're sure you're properly locked in as her FP and she's willing to scratch a bitch's eyes out for looking at you, and I'll give you guidance on what comes next like how to properly sanitise your phone history and how to deescalate the immense, constant levels of domestic violence you'll be subjected to, but this is a good initial goal to aim for.