I see many statements that you must have a fortune to do this. Nah. Lived in SE Asia for years. Owned a 32 foot locally built trimaran. Cost 2,500 US. No electronics no head, tiny old used one cylinder diesel for when wind and wave were on the bow and we needed to make land. Sailed S. China Sea, Sulu Sea, etc. Navigated by compass and chart, watched sky and sea. Laid on float and let my hand stroke dolphins, who spoke to me in the language of our planet.
Cooked on fire on sandbox, caught fish, ate with rice, mangos, bananas, etc. When fish didn’t bite and we ran out of fruit we ate rice. When we ran out of rice we made for any island, all of which had sari sari store. Some might think we were living under survival conditions, but I never felt more alive. Total cost maybe 200 a month for the four of us.
Knew many Asians who sailed the same areas, more or less same way, full time life. Collect shells, fish, do a little trading. Also, entire community of Sea Gypsy’s , google that, and thousands of Hakka, Chinese boat people who live on the water.
In another life I kept a well stocked sailboat at del Ray in LA. During the Rodney King riots we untied from the dock and sailed to San Diego.
If you’re preparing for events that might actually happen, as opposed to the zombie apocalypse, having a small, inexpensive boat as described (not the exact boats, the principle) in the linked books is quite doable - if you like the life and learn the required skills. The sea is not forgiving. Is you learn the skills and accept personal responsibility it can be a wonderful experience.
The boat I kept in del Rey was a sound thirty year old glass hulled sloop. Cost me less than my ten year old Volvo. My family loved it, some of my sons best memories.
https://www.amazon.com/dp/B00405R66M/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1
https://www.amazon.com/gp/product/B07VNHWB97/ref=dbs_a_def_awm_hsch_vapi_tkin_p1_i0