I am going to barbecue 1/2 chicken on a gas grill. I want to use a water mixture with cider vinegar and salt, to baste while grilling. Can you give me any tips as I do this, like time and temperature?
Try a 'Beer Can Chicken' stand. Use an empty (or not) beer (or soda) can to hold your basting liquid and properly place the chicken on the holder (as pictured) and put that on the grill.
As the chicken cooks your basting liquid will steam your chicken to a wonderful effect. IF you keep your lid down the steam will have the effect of continuously basting your bird.
This basting method (cider vinegar and salt) was popular in the midsouth in the 60's. It does have a flavor similar to Carolina pork bbq sauce. Use a temperature of 400 to 450. Apply baste using cotton bbq mop (available on Amazon). It will usually take 30-45 minutes for split/half chicken. Tastes best if you baste each side twice.