Instead of ashes, you could use some dried-out earth from your garden, finely ground charcoal - from your barbeque, or you may have access to ashes from someone’s fire. Whatever you chose to use, the important thing is that we have the interior desire to “turn away from sin and believe the Gospel.”
With a little preparation, you can have a beautiful and prayerful start to the holy season of Lent with this home liturgy. You'll find the liturgy at this link Ash Wednesday Liturgy for Celebration at Home
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Wishing you a prayerful and fruitful Lent.