My booze bill is nearly $500 a month! As for the cell phone, you can get unlimited plans for under $50 a month, and that includes internet access. Most of the time, though, you can get free internet access with the aid of a $19 USB antenna - that's what I did all the way down the ICW to Florida.
If I were cruising in South Florida, the winds are usually sufficient that I would rarely run the engine, which would really cut costs quite a bit. As for food there, I can catch all the fish I want, but you get tired of fish every night for dinner. I bought a case of Ravioli for the trip, and purchased another case while in the keys - that stuff is cheap and very filling. Egg beaters went pretty far, I like them better than real eggs, and they're much less expensive. Sausage is cheap too.
I enjoyed eating hotdogs fresh from the grill most days, lot of toppings make them taste a lot better. Loved fresh Vidalia onions, relish, cheese, sometimes even a little chili. Oh yeah! Grilled cheese sandwich sprinkled with bacon bits made a good lunch as well.
For beverages, Coors Light can be found at discount prices just about everywhere, and I found a Wallgreen Liquor store at the east end of Marathon Key that had the cheapest booze prices in the U.S.. A bottle of melon liquor was only $4, offbrand coconut rum $7 for a big bottle, and the grocery stores had Margaretta mix for just $6 for a large bottle. Sure makes great Green Coconut Margarettas.
Gas was outrageously expensive at the marinas, $512 a gallon, while at the same time the nearby gas stations were selling regular gasoline for $3.15 a gallon. It took a couple trips with a grocery store basket and three 5-gallon jerry cans to top off the boat's 35-gallon tank.
I got to watch moves on the PC using the free WI-FI access I found throughout the trip south. Just go to www.crackle.com
and the movies are all free and even on a 12-inch laptop screen they were enjoyable to watch while anchored in some remote, secluded cove during nasty weather.
I used 20-pounds of propane during the entire 6 months trip, which cost me about $30 at a local gas station. I used it for heat a couple times, but I was very cautious about doing this as it could easily burn all of the oxygen out of the cabin in just a few hours. My cabin seals up pretty tightly. When I had electricity, my heat pump did a great job for both air conditioning and heat, but as anyone knows, electricity in marinas is very expensive.