In a bowl combine the water, apple cider vinegar, lemon juice and sea salt.
1 ½ cups water, 4 tbsp. apple cider vinegar, Juice from ½ lemon, 2 tbsp. sea salt
Stir until all ingredients are well combined and dissolved.
Divide the cucumber, garlic, peppercorn, dill sprigs, and pepper flakes equally between two mason jars.
1 large cucumber, 4 to 6 garlic cloves, 6 fresh dill sprigs, ½ tsp. red pepper flakes, 2 tsp. whole black peppercorns
Pour the water mixture equally between both mason jars until you reach the top. Add more water if needed to fill the jar completely.
Cover with lids, shake everything until well combined and refrigerate.
Marinate 1 to 2 days, and store 1 to 2 weeks in the fridge.