eralc777, like Rocky said, attitude counts for a lot and you sound like you have what it takes.
A huge number of Dominicans have lived their entire lives in conditions like you will experience if in La Union. If they can do it, so can you. The only difference is that you will have to learn to live that way while they have known nothing else.
If you have an inverter, you will have the use of your lights, fans, TV and computer, if you have one. There are inverters with enough capacity to run the fridge, but you may not want to spend that much. Without an inverter, you will have a lot of time in candle and oil lamp light.
There are lots of little colmados all over, and I am sure in La Union, where you can buy food products in small quantities. Very common to see Dominicans buying just enough meat, for example, for the next meal. Without reliabe refrigeration, this is what you do. Milk is available in quart boxes that don't require refrigeration until opened, but yiou may prefer powder milk that you cn mix just before using. Maynot be quite the taste you are used to, but it works fine on cereal, in cooking, and for drinking
If you have a refrigerator, as I assume you will, you will learn to open it only when absolutely necessary and get everything you need out at the same time. This will preserve the cold that you get when there is electricity.
You will want to have jerry jugs or other containers that you keep filled with water and use when there is no water. I have a German acquaintance who lives there and he has a tinaco on the roof that fills when there is water and that gives him several hundred gallons when there is not.
You will want to quickly get acquainted with other expats living there and learn from them the techniques of living comfortably in La Union.
My wife and I lived for 16 years on a cruising sailboat, always anchored out and almost never at a dock. We hauled our water, our food, etc. We didn't have electric refrigeration, only block ice. We showed at night in the cockpit using a 2.5 gallon garden sprayer. Amazing how many showers you can get from 2.5 gallons. When the nights were cold, Barbara heated a teakettle of water so that we could have a warm shower. We enjoyed those 16 years and I wouldn't trade that experience for anything.
I share our experience only so that you know lots of people who never expected to be without all the conveniences have not only adjusted to that style of life but even enjoyed it.
Good luck. I hope you will keep us informed about your transition to life in La Union.