Cost of living in Argentina close to water / lake.

Argentina is less than half the cost of living in Uruguay. Even less if you come with maximum allowed amount of usa $100 bills  cash which can be exchanged for blue dollar pesos at a huge premium 60 to 100% over the official dollar/peso exchange rate.
Argentina is more 1st world than Uruguay.

Good to know and thank you Grandpa.
Can you give me an meduim estimate about cost of living for one person 2 bedroom close to Buenes Aires..and compared down the Atlatic coast ? That would be helpful.

Gracias Grandpa.

If I were you, I'd advertise or otherwise post online to contact the wealthy Argentines who now live in the Miami area. There are tens of thousands of vacant properties needing caretakers or watch-persons. My guess is that you could easily arrange for a house-sitter deal & get a free luxury place to stay in. All of the Argentines in USA speak English. You could probably make a similar deal over here.

But if you do rent, it depends on the place and the deal you could negotiate. There are many more rentals available than tenants who want to rent. The first  asking price is seldom the lowest rent they will settle for. Unfurnished is always cheaper. Cash dollars are worth twice as much as officially exchanged pesos. Thus, for a "dump","  i.e.  a small furnished ground floor  studio maybe US$50 per month. Really nice little 2 bedroom house maybe $300 to $750.` Groceries & booze? Incredibly cheap if you have cash "blue" dollars  & if  you shop in Chinatown or at the cheaper chains like COTO, DIA  or Carrefour. Wine & Beer around $1 per liter.
If you want to eat 1st class meals you make at home you can spend  $200 to $300 per month. If you eat vegetarian or buy the cuts of meat , fish, chicken, etc. that are not popular with the Argentines (Like Liver or Kidney for instance) you can cut your grocery bill by 2/3rds. Eat out? Huge range: 3 Empanadas, beef, ham, Chicken, = filling lunch meal etc. will set you back $1-total with tap-water to drink.
Lunch at a very good restaurant sushi, steak or ??? maybe $10 to $15. Hope this helps.  "Grandpa"