Walking/Cycling/Rail travel across the country to DC, what do I really need?

Hey.

I’m asking Portland because I feel like the best minds for this are here. I do live here too, but not for long!

Thinking about taking the GART because it sounds like there will be the most opportunity for shelter. I don’t want to take a lot, and quite frankly can’t afford much. I’m needing the necessities and have nothing but maybe the right clothes.

Next Adventure is having a blow out sale rn but their tent and sleeping bag supply is limited to extremes. I know I’ll need atleast those.

What would you recommend I get? I have $1500 for the whole trip.