Lilith had 5 dozen water bottles, and since a dozen has 12 water bottles, the total number of water bottles she had was 12 bottles/dozen * 5 dozen = <<12*5=60>>60 bottles
To buy her friend the birthday gift, Lilith originally had to sell her water bottles for a total of 60 bottles * $2/bottle = $<<60*2=120>>120
When she reduced the price to $1.85 to meet the regular price, the total amount of money she had from the sales was $1.85/bottle * 60 bottles = $111
To buy her friend the birthday gift, Lilith has to find $120 - $111 = $<<120-111=9>>9 more
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