Answer:
You did not say if you were retired or if you had other funds, so I will assume the worst case scenario.

If all you have is R100 000, you have to adopt a very conservative investment approach as you cannot risk losing any of the capital. Unfortunately a conservative approach means that the returns will be on the low side. If for example you invest the money and get a return of 10 percent (and this is very optimistic), you will get a R10 000 per year income from it.

This means that in terms of monthly income, you will receive R833 per month. It is clear that this money will not be enough to live on so you will need to do some emergency planning.

Carry on working?

If you are still fit and able, try to get a job, even if it's part-time. Try to live off this money and leave your investment to grow.

If you have children, you need to make them aware that they may need to supplement your income. This may mean that you will have to move in with them.

Living off rental income

If you own a home, you could consider building a cottage on the property to live in while you rent out your home. Maybe your family could help you fund this because at the end of the day it will provide a long term solution.

A small cottage could cost just more than R300 000 to build. If it was financed, the bond would be R300 000. If you could get R6000 for the rental on your home, the bond would be covered and you would have an income of around R2000 per month. (It is wise to keep R1000 in reserve for rates and maintenance). You could also consider taking in a boarder, but make sure you get references and that the rules are clearly defined.

Of course I am making a lot of assumptions here, and you would have to apply these thoughts to your own situation. Unfortunately, there is no easy fix when there is a shortage of retirement funds. You have to make the most of a tricky situation.

If your R100 000 is from surplus savings funds and you have a steady retirement income from other investments, your best bet is to chat with a financial advisor who can evaluate your entire financial situation in order to achieve the best results for you.