$6,000 bucks??? Just stay with the well and the septic tank.
The well water in my part of Florida is sulfur rich.
The folks buying up houses in my neighborhood have lots of money and little tolerance for the old Florida lifestyle.
For two people pulling down $100,000+ per year together, $6,000 is three weeks income. They have money to burn.
My former neighbor Johnny went into roofing. His income was $380,000 in a recent year. He bought a house for his mom on the street and spent over $100,000 renovating it.