Can we (should we) buy admission tickets to Chichen Itza ahead of our trip or are they available only in person on the day of our arrival there? Will one ticket per person cover both the sound and light show that we'll be seeing on a Monday night, followed by our visit to the ruins next morning (Tuesday), or will we have to buy tickets separately for each since they will be on different days? On Monday we will not be exploring the ruins, just taking in the evening show.
On another tangent, regarding bottled water, any recommendations brand-wise and best places to buy? Is bottled water available at Uxmal and Chichen Itza? I know that Meridans posting on this forum have reported no problems at all with local water, but with my fractious tummy, I'd rather not take any chances!