I am sure I am not going to ask this correcly, but what are the "liturgical limits" of using the font/waters of baptism in worship times that are not, strictly speaking, baptisms? For instance, I've read a couple of times about "renewal of baptism" or "rememberence of baptism" services within presbyterian/reformed churches in which part of the liturgy may include placing ones hand in the water or using the water to place a sign on one's forehead. If this is allowed, how much water is allowed? A sprinkle? A handful? What is appropriate, and when would it stray into a theologically "ambiguous" area? Is any amount of water appropriate, or should just the font itself be used in such ceremonies? Is this kept from being seen as a rebaptism because an ordained person does not pronounce the triune formula? How does this connect with our desire to see baptism not just as a moment in time but as an ongoing condition and way of life?
A hopeless muddle, which I cheerfully present for discussion.