Welcome, Gingersaurus! This is a great community for your curly needs and curly questions. It's such a relief to be among others who "get" us. I love to use ACV rinses. I've tried it both ways you mentioned. I find that I get it in my eyes too easily if I'm bent over. I prefer to be upright and will tilt my head from side to side to try and guide the stream where I need it to go. I think the spray bottle sounds like a great idea.
3B, fine, normal to low porosity
Modified CG since June 2010
HGs: FSG, anything with glycerin, Tresemme Naturals conditioner, Curls Like Us cloths, satin pillowcases.