How long can a 1 Month old plant go with out water? (Outside)

I just planted a seed 2 days ago, and 3 are germinating at home. Waiting to plant

In January, i have to leave the plants for 10 days.
Im expecting them to grow by januarry, so they will be 1-2 months old. when i leave.

Im in Australia, and it gets hot in December sometimes up to 80F/30C

What do i do, will they die?

Can i make a bottle with a hole in it or something, and let it gradually drip?


PLEASE HELP BREDDA'S!

Are you on the East coast ? watering wont be a problem this year(la nina) and its only 2-3 weeks(no water) on a dry year that you have to start worrying. W.A is a different story, so dry and hot, 35+ day and 28 at night with no rain and the hot winds dry the soil couple feet down, you would water daily.

Yep, im here in perth bro.
I was thinking about putting a hole in a 2 Litre bottle, and tube with those trickle adjusters, to make it run gradually, reckon that would work till im back?>

Just get a auto retic timer from bunning- <30 bucks and a bit of poly hose.Piece of piss and can be sure your babies are getting a drink.