Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
A case of water contains 24 bottles. A children's camp comprising of 4 groups purchased 13 cases for a 3-day camp. The first group has 14 children, the second group has 16 children, the third group has 12 children, and the fourth group has half of the number of the first three groups combined. If each child consumes 3 bottles a day, how many more bottles of water does the camp organizer still need to buy?

### Response:
 Vikundi vitatu vya kwanza vina jumla ya watoto 14 + 16 + 12 = <<14+16+12=42>>42.
Kundi la nne lina watoto 42/2 = <<42/2=21>>21.
Jumla ya watoto ni 42 + 21 = <<42+21=63>>63.
Kwa siku tatu, kila mtoto anatumia 3 x 3 = <<3*3=9>>9 chupa.
Kambi inahitaji 63 x 9 = <<63*9=567>>567 chupa.
Mwendeshaji wa kambi ameshanunua masanduku 13 x 24 = <<13*24=312>>312 chupa.
Mwendeshaji wa kambi anahitaji kununua 567 - 312 = <<567-312=255>>255 chupa za maji.