This is what I take with me when out walking or cycling. I have tried both a rucksack and shoulder bag and on balance prefer a shoulder bag because it is easier to get stuff out of it. The camera is a Fuji S1000fd.
The book Food for Free is recommended by Ray Mears, by Richard Mabey and published by Collins. this is pretty much a perfect field reference book with clear pictures and descriptions. Everyone who goes walking in the countryside should have a copy.