If the bottles have not been tampered with, the brew is perfectly safe to drink. Sediment can be formed by several factors including ingredients, filtering, temperature, and conditioning/storage...
What are the ingredients in Twisted Tea? Our delicious Twisted Tea products include a malt base made from beer, tea, natural flavors, and sugar. - http://www.twistedtea.com/faqsTwisted Tea FAQs
After taking the firkin out of “cold storage” (should never be colder then 45 degrees F if for any appreciable length of time), you then want to bring the cask up to cellar/serving temperature of 51 – 56 degrees F. At this rising temperature, the finings are most effective in attracting yeast and together they SLOWLY sink to the bottom forming a bed of sediment.http://www.yoursforgoodfermentables.com/2010_02_01_archive.html Pic(k) of the Week: Sam Adams fenced-in
Blue Hills King's Kolsch is an imperial version of the style, packing an ABV of 7.25 percent. The beer pours a dark chestnut into a tulip glass. It's unfiltered; chunks of sediment swirl and drift slowly to the bottom. Baked bread and faint flowers form the nose. http://archive.boston.com/lifestyle/food/blogs/99bottles/2013/09/New Paulaner Bar at TD Garden; new beer offerings in the arena
You likely noticed this when you pulled a cold one out of the fridge. You are more than likely seeing some sort of combination of yeast, tea, and sugar which is corroborated by the solubility....