Cut and slice your vegetables as needed. Pack the vegetables of your choice into a quart-sized wide-mouth mason jar. Place the jar in the sink, since you’ll be pouring hot liquid into it soon.
In a medium saucepan, combine the water, white vinegar, mustard seed, celery seed and sugar. Bring the mixture to a simmer over high heat, then carefully pour the hot vinegar mixture into the jar. You should have enough to completely submerge the vegetables.
Place the pickled vegetables into the fridge for at least 4 hours to marinate. If not eating them right away, securely fasten the lid and refrigerate for up to a month.