When Grissom explains to Sara the etymology of the word 'vodka' he claims that it derives from the Russian 'water of life'. The words that he says in Russian - 'pshenichnaya voda' (with a very bad accent, too) simply mean 'water made from grain'. In fact, vodka originated in Poland, where it was called "gorzalka", meaning "burning water". In Russian, "vodka" is a diminutive form of the Slavic word voda (water), which translates literally as "little water".
When Greg is checking the burn victims clothing for signs of accelerants, he is using a hydrocarbon detector. It shows the presence of hydrocarbons in the clothing with a strong return. Later he tells Grissom that it tested positive for the presence of alcohol. Alcohol is not a hydrocarbon fuel but is in fact a polar fuel (one that binds with water).
Though the area is supposed to be dry and brown (thus the fire danger), the sequence in the hills was filmed in the late winter in California, so the backdrop is lush and green (and not a fire hazard), quite different than the "brown and dry" conditions spoken of in the dialogue.