Yes, you can squeeze the bottles and it's great to wash wounds , brush your teeth etc. , I chose the pull up top version instead of the flip ones ..as I have another normal sports bottle flip top that leaks so I thought I'd try the pull up system instead.Looking a little deeper in the Travel Tap and its bottle can be more handy then the saywer bladders. Only dirty water in the bottle and you can fill up the bottle a lot easier then fill up the squeeze bladders.
Can you squeeze the travel tap bottle?
I'd stick with travel tap from drinksafe systems for the same reasons you described, the chemical decontamination.I recently bought a Travel Tap flip-top. Tested it out at home with a few litres of clean water then in the field with a few litres of water from a couple of lochs after which the flow rate shrunk dramatically from quite good to annoyingly slow. The water had a definite colour so some sediment was present. I suspect the filter does not handle that very well.
After only a few days use the whole top began to pop right off the thread when the bottle was squeezed so back it went. Maybe I just had bad luck. I want to like it because (apparently) it filters chemicals as well as bugs. That could be a big plus over the Sawyer.
Haven't decided yet what to replace it with. Might even get another. I mostly do cycle-touring and The Travel Tap fits nicely in a standard bottle cage. Squeezing water for one wasn't hard (while it was working..) but, if you have a lot of water to process, something which can gravity feed might work better for you.
Yeah the kind of place I need it is "domesticated" countryside: farms, crops, cattle & sheep (sometimes in the water..), maybe a town upstream. I don't actually know how common chemicals or viruses might be in these kinds of areas but it seemed prudent not to take any chances. Out in the hills and wild places I wouldn't think twice about drinking from rivers & burns.
I'm tempted to give the drinksafe 3-in-1 a try next. This works as a straw, a gravity feed, or inline in a hydration system.