Not sure this counts as strenuous - but at the moment I am trying to walk as fast as I can for just over an hour a day. This has me sweating and breathing heavily much the same as when I used to run, and similar to when I cycle in the summer. I don't use sports drinks or power bars. I do have a coffee with butter and double cream before hand, though.
Personally I don't think you need any sports drinks. As far as I know the "sports" nutrition is aimed at giving a continuous input of easily converted carbohydrates designed to go straight though the blood to the muscles. This may not be a good strategy for T2 diabetics. A slight miscalculation can push your BG up, and this will also keep you out of ketosis.
If you are trying to stay in ketosis then you should be loading up with fats before your exercise then concentrating on keeping hydrated with probably some added salts. Some posters exercise fasted to ensure that they are running entirely on fats. This should only be a problem if you aren't carrying any body fat (as can be the case with some elite athletes).