Simple cocktails

[redpickle]

I'm looking for 2/3 simple cocktails for over Christmas. I never seem to have any of the right ingredients so want to get some bits in. I don't like vodka but do have rum, gin, cava, bitters, sugar syrup, elderflower and juices. Are there any more cocktail staples I will need to come up with a couple of simple but special cocktails?
What are the best at-home cocktails that don't contain vodka?

A glass of cava/Prosecco/champagne with some fruit purée (ella's kitchen pouches work a treat) = Bellini

Spiced berry Bellini realfood.tesco.com/recipes/spiced-berry-bellinis.html

Clementine and Prosecco www.deliciousmagazine.co.uk/recipes/clementine-cocktail/

Cranberry and gin www.oceanspray.co.uk/en-GB/Recipes/By-Course/Cocktails/Cranberry-Gin-Fizz

Hot buttered rum www.bbcgoodfood.com/recipes/hot-spiced-buttered-rum

Kir royale - Prosecco & creme de cassis.

variations on Buck's Fizz with fruit juice & champagne/
prosecco depending on your budget. Nice with elderflower actually which you say you have.

A 'proper' champagne cocktail: sugar lump impregnated with bitters, with a little brandy and topped up with champagne.

Cava or Prosecco with cranberry juice is a festive alternative to Buck's Fizz. Or make a sea breeze (see screen shot) with gin instead of vodka