If you can put your cost to the marina, and live like a Colombian. You should be able to do fine. If you shop in the clean American style grocery you will pay dearly for everthing.
The grocery next to Club Nautico had a lunch counter, and it cost half as much to eat there as it did to buy the same groceries. CORRECT, anything geared toward tourist is higher than Miami
. Living there will give you the chance to find where things are reasonable.
In June it was miserable hot, or storming a torrential downpour. You will need a/c.......i2f