Good question, and great forethought! Hope you don't mind, but this inspired me so much I'm going to write a post on it for one of my sites too. (In fact I just did).
I see this two ways.
1) You need $6,000 in 5 years (conservatively).
5 Years is 60 months. So start putting aside into savings account $100 per month, and you'll have $6,000 in 5 years. Your bank will set it up to auto transfer, or you could do it manually.
That's without earning interest. You could also put that $100 into the savings until you hit $1,000. Every time you hit $1,000 put that into a CD (something's better than nothing with interest). Make sure that CD matures on or before you GO date. So the first $1,000 will be ten months from now. That CD will need to mature in 4.5 years. The second will need to mature in 3 years, etc. etc.
2) You actually CAN crowd fund this.
There's a lot of ways, friends, family, church, donations... but here's another way.
2.a) Set up a free blog at Blogger.com.
Make it all about this trip and/or travel in general. Put together a Start Here page describing the trip you want to go on, when, where, why, and tell us that this blog is your journal for planning the trip. Tell us if we help you take it, we can come along too (via pitctures, posts, even live events with Skype or Periscope).
You could set up a proper domain (MyTrip.Com) for $10-12 per year; or, just leave it with the default domain MyTrip.Blogspot.com. Either way.
Domain.Com (Affiliate Link)
Blogger with Customer Domain (Article)
2.b) Put together a guide for travelers.
Call it "The Top 10 things you need to consider when traveling to..." Just use a Word Doc to put it together, make it pretty, and turn it into a PDF.
Gumroard let's you choose a Name Your Price option: Use Gumroad to upload the PDF. Link the Gumroad set up to your blog. Then tell people they can help you take the trip by purchasing your guide for $1 or more.
When the time gets close, you can set up a GoFundMe page, and get the momentum going faster.
Go Fund Me: (HERE)
2.c) In the 4.9 years leading up to your Go Date, write to us.
Tell us about your trip. Why you want to go. What you hope to see. Read articles on other sites, research for your trip, and tell us what you learned getting ready for it. Remind us every so often you only have x days/months/years left to go.
It doesn't have to be daily. You could post weekly, monthly, as often as you research for your trip. It'll help you keep the vision alive, and help us be excited with you.
2.d) Get our email address, and remind us about the trip by posting new stuff every so often.
Use the Gadget's tool to make sure you add an Email follow option to the blog. That way we'll get an update every time you post.
You could probably set all of this up before you go to bed tonight, and start.
If you do this, email Me@DarrellWolfe.com if you do this. I'll become your first follower, and maybe you'll be taking your trip before five years.
Go Fund Me:https://www.gofundme.com/
Savings and Interest: http://bankingbasicsforbelievers.blogspot.com/2016/05/savings-interest-on-your-money-sort-of.html
Setting up a domain on Blogger:
Buying a domain:
I DID write that article after all: