Coghlan's Emergency Camp Stove - the tablets are highly toxic and so is the smoke when it is burned. Throw in the trash, and get something else.

Hand held portable water filter for hiking/camping. I've had a Katadyn brand for years and its always worked and held up wonderfully. They dont seem to have changed the design at all so filters are still available to purchase last I checked. It has a double pumper so it works on the push and pull of the handle and gets a good flow going. No batteries required and the filters last a long time.

https://www.amazon.com/gp/aw/d/B000KUVVY4/ref=mp_s_a_1_4?ie=UTF8&qid=1507476729&sr=8-4&pi=AC_SX236_SY340_FMwebp_QL65&keywords=Katadyn&dpPl=1&dpID=41P045093FL&ref=plSrch

There are more compact versions, but they are more fragile, more work, and less user friendly. I have a life straw too, but that is only usefull when you are at the physical dirty water supply and cannot bottle with it unlike the manual water pump filters.

Edit: also people seem to like these stoves, and they are cheap. https://www.amazon.com/dp/B00079YTS8/_encoding=UTF8?coliid=I1FJ6H2SP28IYH&colid=2WSF630AX5JIE