Easy, portable jacuzzi, preferably for outdoor or basement use.
Step 1: Use Kiddy Pool(s)...
Use a kiddy pool. This model uses 1 x 4 foot by 4 foot pool with another circular pool inside.
WARNINGS: Always check floor support limit, remember water weights 9 pounds per gallon about. Better for basement or outdoor use.
Step 2: Fill With Water..
If you live near the ocean, you can use salt water and save on buying salt.
THE TESTED SOLUTION, BEST SOLUTION:
4-6% salt with filters:
1 u/v fish tank filter
1 carbon fish tank filter
Add .25 (recommended for longer soaks) to 1% epsom salt for calming mineral water (optional)
*The more salt used, the less filtration needed.
Step 3: Use Sunlight to Heat or Heating Element
Get a safe for fish tank or hot tub heating element or coat the inside with a black surface and use outside and sunlight will heat the tub for free!
*Try craigslist for the pools and heating element (if needed).