You probably need a budget. It can be as simple as a paper and pencil. There are also a variety of apps depending on your needs and spending habits. I started using Trail Wallet on my phone through Latin America to keep track of our expenses and with this trip in Andalusia, it's starting to feel necessary. Another app that is more for non-travel budgeting is Pennies which might work better for others.
Groceries: any food items to be cooked or prepared, water, etc.
Trail Wallet allows multiple currencies in the same trip and fetches the current exchange rate. This is really handy if you buy a plane ticket or something online in dollars but are traveling in a different country. It shows your expenses in list view or pie chart, exports your trip data into a CSV file, can set a daily budget to aim for throughout the day.
Obviously, our biggest expenses were fuel and groceries. Accommodation in Latin America included hostels but here, we were able to find free camping spots everywhere we went; on a hill overlooking Granada, in a meadow for two days near Grazalema, or a quiet spot off the road near olive farms.
There is a definite lack of touristy things in this budget. We prefer hiking and being outdoors these days. And not everyone would spend this much on groceries. Some are perfectly happy buying readymade meals or eating out everyday. I used to be this way. We love to cook and eat healthy and we buy local or bio in herbolarios.
Eating out is still bigger than we'd like. We met friends and family in Caceres and Sevilla and we invited them to eat. Subtracting these three meals, it would be $45.53. The remaining six items were cafés and a Moroccan lunch in Granada.
Slowing down helps immensely. Not everyone has the desire do this, especially for working professionals who have only a few weeks vacation a year, but it works for us. This will be even easier in the future when I can use a mobile hotspot and iPad to work from the van.