Laguna De Los Tres - questions

My partner and I are visiting El Chalten in October and we'd love to do the Laguna De Los Tres hike for sunrise.

Would you recommend hiring a guide for this time of year if we are not avid hikers? We are both physically fit, but don't have a ton of experience with difficult hikes.

Will we need crampons for this time of year?

And will we be OK using a Life Straw filter with the available water sources?

Thank you!