1175 kcal/day ( normal army field ration is 3600 kcal but those cost 3 times more Drytech etc)
30 days 249 EUR
90 days 890 EUR
Water filter 1-4 persons 1L / minute handpump 50.000 L lifetime
The katadyn waterfilter is offered for 299 - 339 euro in most shops.
You can order it from ebay for 260$ + 40$ shipping. (300$ = 220E)
It certainly looks like the nicest waterfilter on the market to me :)