Cana - some of the things I found when feeling my way into reduced carbing were fairly simple, but took me a while to fully work out.
One of the fundamental things I learned was that Carb intense items, like a banana weren't really my friend, because they were a big hit, in terms of what I wanted to achieve and also hard on my system. They seemed to take quite a bit of resource to digest. They might have boosted my energy, but also boosted my blood sugars (and carb load for the day). At the time, I was living in an area where we grew bananas in our garden, so no air miles, horrid fertilisers or the like involved.
Once I sussed that, I started to look at tweaking how I fuelled. What I learned than was that I had to time things slightly differently. If I was going to have an energy dip mid afternoon, say, I needed to fuel around a couple of hours beforehand, to get my food into my system.
I've never been a snacker, or grazer, so I found that frustrating, so ended up just upping the content of my meals a bit, and allowed my body to sort out the rest.
Yes, I had a few days or a week, when breaking some of the eating habits to get out of the habit of doing, or eating x, y or z, but our bodies generally help us out.
Finally, I'll say it again, if you are unable to fit your desired way of living around the medication you are taking, it could be time to discuss this with your Doc. Going thirsty, and potentially dehydrated on a medication wouldn't make sense to me. I would want to work out either how I could drink more, or negotiate a tweak in meds to all basic hydration. Dehydration is dangerous.
There are over 400 pharmaceutical options for treating T2, before including insulin, so it seems very likely there is something out there to better suit your lifestyle.