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Gap between breakfast bar countertop and backsplash wall

Just had new quartz countertops installed yesterday for the breakfast bar/pony wall and the kitchen. There's a 1/2" H x 1/2" D x 71" L gap between the breakfast bar countertop and the backsplash wall that's in front of the sink and faucet. I plan on doing the backsplash myself. Questions: what do I fill this long gap with? A ton of caulk? Would mortar or adhesives have trouble sticking to that? The quartz installer told me to fill with spackle. But I read that spackle is not flexible nor water resistant so caulk is better for joints??

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