Tabs/UV/Physical filter. All seem to have their limitations.
Never used anything to date and fairly regularly drink from streams and creeks if they look clean, and seem high enough above farmland and stuff to have any type of run-off, and never really had a problem. Thought it might be a good idea to get something before the Hunt though where I’ll be more dependant on natural water sources than usual.
I can’t fault the Sawyer Mini. It’s relatively quick (quicker than boiling), lightweight and leaves pure water without chemical taste. It’s also good for tens of thousands of litres
My mate uses a small filter and it’s really efficient and good. I used iodine when I was hiking in Borneo. Not heaps ideal long term but extremely space efficient!
We use iodine tabs when hiking. I don’t mind/notice the taste. We have a UV purifier too but don’t use it much as it needs a charge too regularly to be worthwhile on long trips, and is a PITA if you don’t have wide-mouthed bottles.
I use all of these, varied on what I’m doing and where I’m going. Steripen is great, unless the water is dirty. Tablets are fine as long as you don’t mind waiting (it’s 30 min at least, up to 3 or 4 hours to kill crypto. I always keep some in my first-aid kit as an emergency. MSR Miniworks is awesome as long as you can bear the weight/bulk. It attaches to Camelbak/Nalgene/MSR bottles and bladders and pumps fast, and will filter muddy puddles if you’re desperate.