MINIMIZE THE GROUP'S PHYSICAL MEETINGS.
Communicate online: Skype, Whatsapp, Facebook group/chat, share files on Google Drive, Dropbox etc. Now is also a great time to make a movie just by yourself!

MAKE YOUR SCRIPT AS COMPACT AS POSSIBLE.
Prefer one or two simple locations, preferably outdoors, not crowded public places or someone’s home. Take this as a positive screenwriting challenge, how to tell a story in a concise but interesting way? Check 2014 winner movie as an example https://bit.ly/2UxvaRt

ONLY FEW PEOPLE WORKING ON A FILM SET!
The whole group does not have to come together behind the camera. Usually all you need is the director, actor/s and camera/boom operator. Also, try to tell the story with one or two characters - and remember to keep the safe distance between actors.

REMEMBER HYGIENE!
Yeah, you are going to be busy, but remember to wash your hands often and carefully! Keep the equipment you need for the movie clean and preferably personal, for example no one touches the camera/boom except the operator. If possible, read the script from your own personal tab/cell, avoid passing the paper version of the script hand to hand.

BE CREATIVE!
Are you technically skilled? Consider animating your movie - good old play doh stop motion animations are also very welcome! Here is a finalist movie from 2013, made with Legos: https://bit.ly/2UtIGpx

WORK REMOTELY AS A TEAM!
You can easily handle the post-production remotely. Many software programs offer the ability to collaborate, you can work on scriptwriting, editing and sound design on common platforms. For instance these softwares offer collaboration opportunities:

https://www.finaldraft.com/learn/collaborate/ (screenwriting)

https://helpx.adobe.com/team-projects/using/getting-started.html (Adobe, editing etc.)

https://www.pro-tools-expert.com/home-page/2016/3/28/pro-tools-125-cloud-collaboration-all-you-need-to-know  (Pro Tools, sound design)

2019 finalist movie which was made working remotely: https://vimeo.com/showcase/6038050/video/340099263

WATCH THE FINISHED MOVIE ALONE FROM HOME!
As nice it would be to gather together to admire the accomplishment, share the movie link between the team and avoid group gatherings at someone’s home.

Tips for filmmakers:

http://kaikkikuvaa.fi/

https://johnaugust.com/scriptnotes

https://www.masterclass.com/classes/shonda-rhimes-teaches-writing-for-television/chapters/introduction-27e90d80-c06f-46d4-9d0e-67e06bc5b6ea