I use a bottle in the van or a sly one round the back of a custies house if I think I can get away with it.... i've nearly been caught a couple of times!
re no.2's, once or twice in the morning and that usually does me. if not, there's always a supermarket / mcdonalds / library / doctors about somewhere!
a friend of a friend once did a no.2 in the bottom of a plant pot and put the plant back in on top of it! genius!