For best results, you can prepare the dip up to a day in advance to let the flavors meld, then cover and refrigerate until serving, stirring just before placing it in the chip bowl. To keep chips crisp, wait to pour them into the serving bowl until right before guests arrive, and consider offering a mix of sturdy chips and dippers like pretzels or vegetable sticks for scooping. Adjust seasoning after chilling, since flavors can mellow, by adding a pinch more ranch mix, salt, or pepper to taste. If the dip thickens too much in the fridge, loosen it with a tablespoon of milk at a time until it reaches your preferred consistency.