when you go out and about, sometimes a person will want to sell you whatever..and a normal approach would be one of "light intimidation", or playing the "color route" and used first would be one of "feel sorry for me"...anything "physical" is generally out of the question.......most are just trying to make a living
and a simple no thanks will be enough........DO NOT use the phrase "not today..maybe later"...you are now going on a journey of sorts..one that will pin you down to a date, time and place when "later" will happen....more or less you have just made a purchase....lol go with it......have fun......