Reavers are tough sh*t, specially when you play at very high.
Give the girl's boyfriend(ronald laren) the quantums and get caps, there are about maximum 90 quantums in vanilla game, so far I've got 76, so give him 30, you can still get the others, btw with broken steel dlc you can get the quantum chemist perk at level 26 which turns every 10 nuka colas in your inventory into quantums, so if you like it you can have more.
I've collected about 320 nuka colas(collected, never bought any) till now.
It must be the dunwich building, theres a ghost(harmless) in there, shows a flash back.
The man you killed with sniper rifle is sam warrick, theres also another guy in game(random) who carries a railway rifle.
Anyway here's some screens of Point Lookout:
Nice screenies
BTW, yup that's Dunwich Building and that man name was sam warrick. BTW, I had drunk so may of e'm I think I will not be able to deliver her required number of bottles
BTW, That ghost turned into a Glowing Fearl Ghoul but I killed it anyway with 10mm SMG!!
Searched that building and got plenty of books that increased my skill level. Got some audio tapes.
Got out from there and got to Moira for caps. Again went to egulators HQ but on the way I was attacked by Enclave soldiers but blasted them with Frag grnds anyway. Found a armory. Neutralized all Raiders. BTW, The armory is heavily radiated.
From there headed to bethedsa office - This the really a fun Part. Killed all raiders from both easty and west wings and delivered all fingers to regulators HQ for caps