I'm a broken record on this, folks.
Situational Time Management
This an acceptance thing. It's alright that we can't write every day because of family, income-producing work, tending to the apocalypse, and other types of obligations. Writing this week is different than writing last week or the week before, and it's going to be different than writing next week or next month. Don't panic!
The Unit System
Recognizing that it's not necessary to work in eight-hour shifts is a huge help. The knowledge that creative work, and, for that matter, many other kinds of work, can be done in small units or segments of time, when you're not washing your hands or wiping down the kitchen counters with disinfecting wipes, is encouraging. You can do something with 45 minutes or even 20 minutes. Again, do not panic, people!
Goals And Objectives
Knowing what you want to work on ahead of time may be the best technique for using time when you don't have a lot of it because you're going out to the store every other day to buy toilet paper, soap, and every kind of over-the-counter viral treatment you can think of. Determine your goals for a period--a year or the summer or a two-week quarantine period--and then decide what objectives/tasks you need to do to meet those goals. Then when you only have a day or a couple of hours or thirty minutes, you can work on a task you really want done.
Personally, yesterday I worked on Goal 4 of my 2020 goals, a YA thriller, because I want to bring some material from that project to my writers' group next Monday night, assuming we are still gathering in public places here. And, if we're not, I've revised part of a scene. How great is that? Hey, nothing to panic about here!