In a certain code language, 'nu vu du' is written as 'water is life', 'hu du ru' is written as 'bring me water', and 'tu vu ru' is written as 'bring is well'. What is the code for the word 'well' in that language?

tu

Given; In a certain code language, 'nu vu du' is written as 'water is life', 'hu du ru' is written as 'bring me water', and 'tu vu ru' is written as 'bring is well'. 

So,

nu   vu   du  =  water  is  life

hu  du  ru  =  bring  me  water

tu  vu  ru  =  bring  is  well

Thus,

Code for well is tu