State the number of covalent bonds in $H_{2}O$ and $CCl_{4}$ and provide their bond structures and Lewis structures.

(N/A) In water $(H_{2}O)$,there are two $O-H$ covalent bonds. In carbon tetrachloride $(CCl_{4})$,there are four $C-Cl$ covalent bonds.
$H_{2}O$ Structure:
- Each $H$ atom attains a duplet (two electrons).
- The $O$ atom attains an octet (eight electrons).
$CCl_{4}$ Structure:
- Each $C-Cl$ bond consists of one electron from $C$ and one electron from $Cl$,satisfying the octet for all atoms.