A fun an easy way to practice phonics is to let your child make up words with magnet letters. Whatever order they put the letters in, you sound out the "word" they made. If they make a word with no vowels, point out that you can't say a word without vowels, point out what the vowels are, and have them add some until the word is more readable. If you have color coded magnet tiles where the vowels are a different color (like those that come with several phonics programs, such as All About Reading and Barton) it's even easier to reinforce this idea using those.
My kids loved playing this game, and it really helped them associate the sounds with the letters and learn about how to sound out words.