Garden

Hi,
Based on my experience the best way to save water is to water the  garden twice a day, each time for a very short period of time (that means low water quantity): once in the early morning and once late in the evening (rather than one long watering).  Doing so you minimize the evaporation and almost all the water goes to the plant's roots.  
Best regards,

I think deeper watering in the morning is best. It's the way I've always done it  and I've always had success. My logic is that with deeper watering you get deeper roots. It's usually only the top couple of inches that dry out in high heat. Shallow roots are more prone to getting burned. (Water in the morning to limit evaporation while you're watering and the water soaks deeper.) You can water less often this way. Also, make sure you mulch around your plabnts. This will help keep the roots cool and drasticly slow down evaporation.
I hope this helped. Good luck.  

I use soaker hoses everywhere.  I snake them trough the flower beds, veggie patches,...wherever needed.  I like the quick release hose ends so that I just pull the regular hose over to whichever soaker needs to be on and plug it in.  I use these in addition to a timed sprinkler system which waters any lawn areas.  Don't water at the height of daily heat or late in the evening, the first way can cause major scorching and the second way invites mildew, snails, other nasty things...The best time is early in the day or just before daybreak if you are automated.

Well like you said it's hot so in this case I proubley would take a umbrella and the hose and be in clothes that can get wet. You might not need the umbrella because with the hose if you ever get hot while your watering your plants just spray your self and thats how you should water your plants on a hot day.

I completely agree with Kaymao, most plants benefit from deeper watering than shallow surface watering.  More plants suffer from improper placement, and too much water than ever die from too little water.  If you have plants that need more than a really good soaking once a week, you can use 2 or 3 liter plastic bottles.  Cut off the bottoms, take off the caps and push down into the soil close to your plants without harming the roots.  Fill the bottle with water and it will drip away keeping the soil around your more thirsty plants good and moist.  There are special drippers designed for this that you can purchase, but the bottles do the trick while you test the theory.  Best of luck