Depending on budget, either 1) drink out of the lake or 2) get a gravity filter.
I’ve been on 30+ trips, always drinking out of the lake at least some of the time, and most of the time all of the time, and I’ve never had a problem. Just get out away from shore, and don’t draw from near moving water.
If that’s not your thing, then do yourself a huge favor and get a gravity filter. Don’t get the Katadyn; instead, go inline like Sawyer or Platypus. Much, much, much better option.
I could have written the above. I agree on all counts.
Shorter reasonably easy portages- when we wanted to duck into the BWCA for an easy trip with good fishing we’d go into Wood Lake in the Ely area. IIRC Basswood is 2 or three shorter portages away if you wanted to check that out. Wood always came through with the fishing for walleyes, SM Bass and Pike. Nice campsites too.
Insula is a good choice too for ease, expect company though and get your campsite early.