Buy barrels specifically for water storage - they are rated for long term storage and are food safe. Sorry I don't have the brand I got at hand but it wasn't too difficult to find them - they drop shipped it to my house for cheaper than I would have expected. It was similar to this: https://www.amazon.com/Augason-Farms-Storage-Barrel-55-Gallon/dp/B06Y2H5GVX/ref=sr_1_7?crid=243SQ31QKZWON&keywords=water%2Bstorage%2Bbarrel&qid=1657692713&sprefix=water%2Bstorage%2Bbarrel%2Caps%2C170&sr=8-7&ufe=app_do%3Aamzn1.fos.18630bbb-fcbb-42f8-9767-857e17e03685&th=1
Homeless shelters do not lack for money, believe it or not.
Most areas with serious homeless populations have TONS of funding for shelters and various programs.
They don't work. Most of these people need to be institutionalized.
I recommend the book San Fransicko to learn more about the failures of the Homeless Industry in alleviating ANY of the suffering caused by this intractable problem.