Water souces on Day One

Hi all
Hopefully this is my last OT question!
I read some advice on Facebook by someone who recently completed the OT to carry three litres of water on the first day (for the ascent up to Marion’s Lookout) which seems like a lot of extra weight. In any case, I am leaning towards going the Horse Track route. If the Horse Track, how much should I carry for ascent? I’m hoping to get away with filling just two 600 ml recycled Gatorade bottles at the start (between us we will carry some empty bottles though--enough to fill seven litres). Is 1200 mls to start enough? I read there are four creek crossings—two at the Scout hut and Marigold and Plateau--on the track. Is there any danger they have dried up in this hot summer?
Also should we filter water collected on the Horse Track on the first day? Alternatively, would we better off starting with as much tap water as we can carry filled from the tap at our accommodation?
Thanks again in advance to anyone who can answer.
Hopefully this is my last OT question!
I read some advice on Facebook by someone who recently completed the OT to carry three litres of water on the first day (for the ascent up to Marion’s Lookout) which seems like a lot of extra weight. In any case, I am leaning towards going the Horse Track route. If the Horse Track, how much should I carry for ascent? I’m hoping to get away with filling just two 600 ml recycled Gatorade bottles at the start (between us we will carry some empty bottles though--enough to fill seven litres). Is 1200 mls to start enough? I read there are four creek crossings—two at the Scout hut and Marigold and Plateau--on the track. Is there any danger they have dried up in this hot summer?
Also should we filter water collected on the Horse Track on the first day? Alternatively, would we better off starting with as much tap water as we can carry filled from the tap at our accommodation?
Thanks again in advance to anyone who can answer.