How to fund the indie hacking journey?

Assuming you need a few months of runway before you've built something profitable, here are the options I see - I'd love people's thoughts on which they prefer and why:

1. Keep the day job and hack on evenings/weekends. The downside of this is that there is a big difference between spending 2/3 hours a day on your project vs 8/9 (or more). This is probably the default, but what if you're in a space where you need to move really fast?
2. Save up enough to last a few months and live really cheaply a la this tweet. The downside here is having to delay until you have the savings to do this and the risk of running out of runway (though maybe this is good as it acts as a forcing function?).
3. Raise a pre-seed round of funding, if you can, without any intention of getting further funding. This way you get a good amount of runway, but the downside is that if you're taking on investors, you are implying to them that there will be an exit. Also, I guess that can be a slippery slope where you start raising more and more.

So whats your choice? And why? Are there other options I missed?