I'm the budgeter in our house, and I keep an annual budget in which I use spreadsheets interlinked to each other, and a tab with fixed values that I feed data to as prices change such as the value of the WU dollar, the BCRA dollar, our health insurance, etc.
I make some projections based on the crawling peg + brecha, but it requires a near daily intervention to be anywhere near accurate, and for anything more than a month out I'm grasping at straws as I have no idea what things will cost.
If you have dollars/foreign currency, the best way to budget is paying everything via credit card, especially cuotas sin intres when possible, and then paying the statement when it comes as the odds are good that the dollar will have increased in the 30 days between billings, and you'll save money vs. selling dollars then paying cash.
Just don't save in pesos, only keep what you need for a week's spending max, and you're set. Nothing is set in stone here.