Scratching head, remaining prophet provides bottles of drink? (9)

'bottles of drink?' is the definition.
'thermoses' can be an answer for 'bottles' (thermos is a kind of bottle). I'm not certain of the 'of drink?' bit.

'scratching head remaining prophet' is the wordplay.
'scratching head' means to remove the first letter (the first letter or head is scratched out).
'remaining' becomes 'other' (similar in meaning).
'prophet' becomes 'Moses' (Moses is an example).
'other' with its first letter taken away is 'ther'.
'ther'+'moses'='THERMOSES'

'provides' acts as a link.

Can you help me to learn more?