Moscow is super advanced with regards to online ordering & delivery. If you want you never have to leave the house ;) Ozon is Russia's Amazon and you can literally buy anything here, from toilet paper to iPhones and airplane tickets!
Some items can be delivered to you door within one hour! You can check which ones exactly after choosing Ozon Express from the menu and writing in you address.
And to not to stay home waiting for delivery, you can choose picking your purchase from a special Пункт выдачи - a delivery pickup office.
There is an Ozon app for mobile devices as well - both for Android and Apple.